1. Why the Ertiga Is a Strong Candidate for CNG Kit Installation in Maruti Suzuki

The Ertiga is not just a good CNG candidate — for anyone carrying passengers for a living, it is close to a business decision. Here is why CNG kit installation in Maruti Suzuki Ertiga works so well, and where the compromises lie.

• The 1.5L K15C has the torque to carry the weight: 137 Nm is enough to move a fully loaded 7-seater plus a 60–70 kg cylinder without feeling breathless. This is the single biggest reason the Ertiga converts better than a 1.0L hatchback.
• Massive commercial demand: The Ertiga dominates the 7-seater taxi, tour-operator and intercity fleet market. A CNG Ertiga can cut fuel cost per kilometre by roughly 45–50%, which directly changes the profitability of the vehicle.
• Factory S-CNG precedent: Maruti already sells the Ertiga S-CNG, so mounting points, bracket designs and wiring routes are proven. The platform was engineered with a cylinder in mind.
• Long wheelbase and stable rear suspension: The Ertiga's rear suspension and wheelbase handle a full boot-mounted cylinder far more gracefully than a small hatchback. Rear sag is manageable, and helper springs are rarely needed unless the vehicle is permanently loaded.
• Large cabin, flexible layout: Because the third row can be folded or removed, the Ertiga gives you a genuine choice of cylinder layouts — something a sedan or hatchback cannot offer.
• Excellent long-distance range: With a 60L cylinder plus the original 45L petrol tank, the Ertiga becomes a genuine 700+ km intercity vehicle, which is ideal for outstation fleet work.
• Strong resale value: A properly documented, RTO-endorsed CNG Ertiga sells quickly in the commercial market, often at a premium over an equivalent petrol unit.

2. Ertiga Generations, Engines & CNG Compatibility

The Ertiga has been sold in India across three generations. The exact CNG kit installation in Maruti Suzuki Ertiga approach, and especially the cylinder layout, depends on which one you own.

Third-Generation Ertiga (2018–Present, facelifted 2022)

• 1.5L K15C (2022 onwards): 4-cylinder, 103 PS / 137 Nm, DualJet with dual injectors. This is the current engine and the focus of this guide. Requires a high-flow reducer and OBD-II compatible sequential kit.
• 1.5L K15B (2018–2022): 4-cylinder, 105 PS / 138 Nm. Slightly simpler than the K15C and equally receptive to sequential conversion.

Second-Generation Ertiga (2012–2018)

• 1.4L K14B: 4-cylinder, 95 PS / 130 Nm. Fully convertible with a standard sequential kit. Very common in the commercial market.
• 1.3L DDiS diesel: Not eligible for CNG conversion.

First-Generation Ertiga (2012–2018, pre-facelift)

• 1.4L K14B petrol: Convertible, but check your state RTO's stance on older BS3/BS4 vehicles and the current status of the fitness certificate before booking.

Only petrol engines are supported for CNG conversion. Diesel Ertiga variants and the CNG-converted diesel units seen in some markets are not part of this service.

3. Factory S-CNG vs Aftermarket CNG Kit Installation in Maruti Suzuki Ertiga

Maruti sells the Ertiga S-CNG in the VXi and ZXi trims, but only with the 5-speed manual gearbox. So should you buy the factory CNG version or go for aftermarket CNG kit installation in Maruti Suzuki Ertiga? Here is an honest comparison.

4. Which CNG Kit Is Right for Your Ertiga?

Only a sequential MPI (multi-point injection) kit should be used for CNG kit installation in Maruti Suzuki Ertiga. A venturi or open-loop kit has no place on a BS6 1.5L engine — it causes backfiring, check engine lights, power loss and RTO rejection.

Recommended Kit Specification for the 1.5L K15C

• Type: Sequential gas injection with dedicated CNG ECU
• OBD-II compatibility: Mandatory for BS6 Phase 2 vehicles and required for AIS-024 compliance
• Reducer: High-flow unit — the Ertiga is heavier than a hatchback and often carries a full load, so an undersized reducer will lean out at high RPM
• Injectors: Larger-flow injectors than the 1.0L/1.2L kits; mismatched injectors are the most common cause of poor Ertiga conversions
• Certification: AIS-024 (and AIS-028 where applicable) type approval
• Safety: Excess-flow valve, pressure relief device, manual shut-off valve, and a certified cylinder with PESO hydro-test

Popular Kit Brands for the Ertiga

5. Performance & Real-World Mileage After Conversion

Maruti publishes a claimed figure of 26.11 km/kg for the factory Ertiga S-CNG. Real-world numbers after aftermarket CNG kit installation in Maruti Suzuki Ertiga depend heavily on how many people and how much luggage are on board.

Figures assume a correctly calibrated sequential kit with a high-flow reducer, a 60L water-capacity cylinder (≈ 48L usable gas), normal tyre pressures and mixed city/highway driving. Fully loaded intercity work with the AC on all the way will sit at the lower end.

What About Power Loss?

With a properly tuned sequential kit, expect an 8–12% reduction in peak power and torque on gas. In practice, this means:

• City driving with 2–4 occupants: Barely noticeable. The 1.5L engine has enough torque that the car pulls cleanly from low speed in second and third gear.
• Highway with 7 occupants and luggage: Noticeable on inclines and during overtakes. You will use a lower gear than you would on petrol. This is normal and not a sign of a bad installation.
• 6AT under kickdown: The automatic will hold a lower gear for longer on gas. Proper calibration, plus setting the changeover to petrol under hard acceleration, keeps this feeling natural.

6. Boot Space, Third Row & Cylinder Layouts — The Most Important Decision

This is where CNG kit installation in Maruti Suzuki Ertiga differs from every hatchback page on this site. The Ertiga has three rows, and a cylinder has to go somewhere. Your choice of layout decides how usable the car remains.

Ertiga Petrol Boot Space for Reference

• 209 litres with all three rows upright
• ~550 litres with the third row folded flat
• ~803 litres with both the second and third rows folded

Layout A — 60L Cylinder, Third Row Permanently Folded (Most Common)

• Best range: roughly 330–370 km on gas, plus the 45L petrol tank
• Third row folds flat and stays folded permanently; the cylinder sits in a custom bracket in the extended boot floor
• Seating capacity drops from 7 to 5 — the RC must be amended at the RTO
• This is the standard layout for commercial Ertigas, tour operators and app-based fleets
• Still plenty of room for luggage above and around the cylinder for 4–5 passengers

Layout B — 55L Cylinder, Third Row Folded

• Slightly less range than the 60L (roughly 300–340 km)
• Sits slightly lower, so the load floor is a little more usable
• Same seating-capacity implication: 7 becomes 5, RC amendment required
• A good choice if the car is mostly used with 4–5 people and luggage

Layout C — 45L Cylinder, Third Row Retained (Niche)

• Allows 7-seat capacity to be retained in some custom low-profile bracket designs
• Range drops to roughly 220–260 km on gas
• Boot effectively disappears — no room for luggage behind the third row
• Only sensible if you genuinely need 7 seats daily and rarely carry luggage
• Must be confirmed with your installer before booking; not all bracket designs support this

Practical Tips for the Ertiga Cylinder Layout

• Insist on a custom bracket rather than a generic one — the Ertiga's third-row floor is not flat, and a poorly designed bracket rattles and cracks over time.
• Ask for a load floor or false floor over the cylinder. It makes the boot usable for luggage, protects the cylinder from impact, and stops items sliding into the valve.
• Keep the cylinder valve and the manual shut-off accessible from the rear hatch at all times.
• If the car does commercial duty, get the installation photographed at each stage. Fleet inspections and insurance claims go far more smoothly with documentation.
• Never let luggage rest directly against the high-pressure line running under the third-row floor.

7. Variant-by-Variant Compatibility for CNG Kit Installation in Maruti Suzuki Ertiga

8. Installation Process Step-by-Step

A professional CNG kit installation in Maruti Suzuki Ertiga takes about 6 to 8 hours at our workshop, largely because of the third-row bracket fabrication and the extra care needed with the larger engine and the automatic gearbox. Here is exactly what happens.

Step 1 — Pre-Installation Health Check & Layout Consultation (≈ 1 hour)

• OBD-II scan for existing fault codes
• Compression test and spark plug inspection
• Check engine mounts, coolant level, battery health and rear suspension condition
• Confirm the cylinder layout — 60L/55L with the third row folded, or 45L with the third row retained
• Confirm whether the RC will need a seat-capacity amendment

Step 2 — Cylinder Bracket Fabrication & Mounting (≈ 2 hours)

• Fabricate a custom bracket for the Ertiga's third-row floor
• Bolt the bracket to the chassis mounting points with anti-vibration padding
• Install the cylinder with correct torque and check the load distribution
• Route the high-pressure stainless steel line along the underbody, away from heat and moving parts
• Install the filling valve in a protected position near the fuel filler

Step 3 — Reducer, Injectors & Plumbing (≈ 1.5 hours)

• Mount the high-flow reducer/vaporiser in the engine bay
• Tap into the engine coolant circuit to warm the reducer
• Drill and fit the gas injector rail onto the intake manifold
• Connect the low-pressure gas line from reducer to injector rail

Step 4 — Wiring & CNG ECU (≈ 1 hour)

• Mount the CNG ECU in a heat-protected location
• Wire the injector emulator, OBD link and changeover switch
• Install the gas level indicator and changeover switch on the dashboard
• Fuse and protect all electrical circuits properly

Step 5 — Leak Test & Pressurisation (≈ 45 minutes)

• Fill the system with gas and apply soap solution to every joint
• Check the excess-flow valve and pressure relief device operation
• Confirm zero leaks before proceeding

Step 6 — ECU Tuning & Road Test (≈ 1.5 hours)

• Connect a laptop to the CNG ECU and the car's OBD-II port
• Monitor short-term and long-term fuel trims on petrol and gas, at idle, part load and full load
• Adjust the injection map for smooth idle, clean cold starts and correct power delivery
• 6AT only: road test in stop-and-go traffic and on a highway incline to verify shift behaviour and kickdown
• Verify no check engine light after a mixed 50+ km drive

Step 7 — Documentation Handover

• Installation certificate
• AIS-024 type approval certificate for the kit
• PESO hydro-test certificate for the cylinder
• Guidance on RTO submission, insurance endorsement, and the seat-capacity amendment if applicable

9. Complete Cost Breakdown for CNG Kit Installation in Maruti Suzuki Ertiga (2026)

Optional Extras

• 55L cylinder instead of 60L: −₹1,000 to −₹2,000
• 45L cylinder with third-row retention bracket: +₹2,000 – ₹4,000 (custom fabrication)
• Premium Italian kit (Lovato/BRC): +₹5,000 – ₹8,000
• Heavy-duty rear helper springs (for permanently loaded commercial use): ₹4,000 – ₹6,000
• Annual Maintenance Contract (AMC): ₹3,500 – ₹5,000 per year
• Commercial documentation package (permit, fitness and seat-capacity coordination): quoted separately

10. RTO Endorsement & Legal Requirements (Including Commercial Vehicles)

Driving an Ertiga after CNG kit installation in Maruti Suzuki Ertiga without an updated Registration Certificate is illegal. The RTO must formally endorse the fuel type change on your RC — and for most Ertigas, there is a second change to process at the same time.

Documents Required — Private Vehicle

• Original Registration Certificate (RC)
• Valid insurance policy (must be endorsed to include the CNG kit)
• Valid PUC certificate
• AIS-024 / AIS-028 type-approval certificate for the kit (provided by us)
• Installation certificate from the workshop (provided by us)
• PESO hydro-test certificate for the cylinder (provided by us)
• Application for alteration of vehicle (Form 26) with the prescribed fee
• Address proof and identity proof

Additional Requirements — Commercial Vehicle

• Valid permit and fitness certificate
• Seat-capacity amendment if the third row is permanently removed or folded (7 seats → 5 seats)
• Updated insurance reflecting the new fuel type, kit value and seating capacity
• Vehicle inspection at the RTO, which is standard for commercial alterations
• Compliance with any state-specific speed governor or taxi-livery rules

Timeline

Private vehicle endorsement typically takes 7 to 30 working days depending on your RTO district. Commercial vehicles take longer — budget 3 to 6 weeks — because the alteration involves both a fuel-type change and a seating-capacity change, plus a physical inspection. We coordinate the entire process.

11. ECU Tuning for the K15C Engine

This is where a cheap installation and a professional one diverge sharply. The K15C uses DualJet injectors and is sensitive to air-fuel ratio errors, and the Ertiga's extra weight makes those errors far more consequential than in a hatchback. A "plug-and-play" kit that is never calibrated will cause:

• Check Engine Light (CEL) illumination
• Rough idle and stalling at traffic signals
• Poor cold starts on gas
• Lean running under load — the most dangerous failure mode on a loaded MPV, because it raises exhaust valve temperatures and can cause long-term engine damage
• Poor fuel economy — sometimes worse than petrol

What Proper Calibration Involves

• Connecting a laptop to both the CNG ECU and the vehicle's OBD-II port simultaneously
• Recording short-term and long-term fuel trims on petrol at idle, part load and full load
• Adjusting the CNG injection map so gas trims mirror petrol trims within ±5%
• Testing with a load — 5–7 passengers or ballast — not just an empty car around the block
• Calibrating the changeover threshold, warm-up behaviour and high-RPM petrol blend
• Verifying that no CEL is triggered after 50+ km of mixed driving

A properly tuned CNG kit installation in Maruti Suzuki Ertiga should feel close to petrol in normal driving, with no hesitation and no warning lights, and should hold clean fuel trims even when fully loaded.

12. 6AT (Automatic) Specific Notes

The Ertiga 6AT uses a torque-converter automatic. It is fully compatible with CNG, but it is the single most calibration-sensitive combination we work on. Extra care here is not optional.

• Kickdown behaviour: The 6AT shifts based on engine load and throttle position. A torque reduction on gas can cause the gearbox to hold a lower gear longer or hunt between gears on inclines. This is fixed with proper load-based mapping, not by turning the gas pressure up.
• Torque-converter slip: In bumper-to-bumper traffic, a poorly tuned 6AT on gas can feel like it is slipping. Proper low-load mapping resolves this almost entirely.
• High-RPM petrol blend: For the 6AT we strongly recommend setting the changeover to petrol above roughly 4,000 RPM or under heavy throttle. This protects the gearbox from working against a torque deficit during kickdown and makes the car feel much more natural to drive.
• Fluid temperature: Gas operation does not directly affect the gearbox, but avoid sustained full-load driving immediately after conversion while the calibration is still being validated.
• Road test is mandatory: Insist on a stop-and-go traffic test and a highway incline test before accepting delivery. A 6AT that feels fine on a flat empty road can feel very different with 7 passengers on a flyover.

13. Maintenance & AMC Schedule After Conversion

CNG systems are low-maintenance, but they are not maintenance-free — and on a high-mileage Ertiga, neglect shows up quickly. Following this schedule keeps your CNG kit installation in Maruti Suzuki Ertiga running smoothly for years.

An Annual Maintenance Contract (AMC) bundles most of these tasks into a single yearly fee and typically includes unlimited leak checks and ECU diagnostics. For commercial Ertigas doing 3,000+ km a month, an AMC is not a luxury — it is the cheapest way to keep the vehicle earning.

14. Warranty & Insurance Impact

Warranty

Aftermarket CNG kit installation in Maruti Suzuki Ertiga typically voids the engine and powertrain warranty. The remainder of the vehicle warranty — on bodywork, electricals, air conditioning and so on — generally stays intact, although this depends on your dealer's interpretation.

If your Ertiga is still under Maruti's standard warranty, weigh the remaining warranty value against the CNG savings before converting. For commercial users the calculation is almost always favourable within the first year.

Insurance

You must inform your insurer immediately after CNG kit installation in Maruti Suzuki Ertiga. The policy needs to be endorsed to include the CNG kit as an insured accessory, and — for commercial vehicles — to reflect the amended seating capacity. Expect a premium increase in the range of ₹2,000 to ₹4,500 per year, higher for commercial policies.

Failing to declare the CNG kit can result in claim rejection or a reduced settlement in the event of theft, fire or damage to the kit.

15. Common Mistakes to Avoid

• Choosing a venturi kit: Cheaper upfront, but unsuitable for any BS6 engine. Causes backfiring, power loss and RTO rejection.
• Fitting a hatchback-sized kit: An undersized reducer or injector set on a 1.5L loaded MPV causes lean running and long-term engine damage. Always specify a 1.5L high-flow kit.
• Skipping ECU calibration: A kit installed but never tuned is only half-installed. Insist on laptop calibration with fuel-trim verification, tested under load.
• Forgetting the seat-capacity amendment: Removing the third row without amending the RC is a permit and insurance violation on a commercial Ertiga.
• Not getting RTO endorsement: Illegal, and it will cause problems at claim time, resale and permit renewal.
• Using a generic cylinder bracket: The Ertiga's third-row floor is not flat. A generic bracket rattles, cracks and can compromise the cylinder mounting over time.
• Ignoring the leak test: Never accept a vehicle without witnessing a proper soap-solution leak test on every joint.
• Using a non-certified installer: Only AIS-024 certified workshops can issue valid documentation for RTO endorsement.
• Skipping the hydro test: Mandatory every 3 years by PESO. Driving with an expired hydro test is illegal and unsafe.
• Not informing the insurer: A simple call can save you a rejected claim later.
• Neglecting rear suspension: A permanently loaded commercial Ertiga benefits from helper springs. Ignoring sag accelerates tyre wear and affects stability.

16. Ertiga vs Other Maruti Models for CNG

If you need 7 seats and plan to drive commercially, the Ertiga remains the benchmark. The XL6 is the same platform with captain seats and slightly better isolation, but costs a little more to convert. If you only need 5 seats, the Dzire offers better boot retention and lower running cost per kilometre — but it cannot carry the passenger load.

17. Running Cost & Payback Calculation

Numbers make the case better than words. Here is a realistic comparison assuming petrol at ₹105/litre with 15 km/l real-world economy for a loaded Ertiga, and CNG at ₹80/kg with 21 km/kg economy.

Figures are indicative and exclude maintenance differences. Actual savings depend on local fuel prices, passenger load, driving style and traffic conditions. Commercial operators doing 4,000+ km a month typically recover the entire cost within a single quarter.

18. Pros & Cons of Ertiga CNG

19. Frequently Asked Questions

How much does CNG kit installation in Maruti Suzuki Ertiga cost?

Expect ₹45,000 to ₹55,000 all-inclusive for a sequential MPI kit with a 60L cylinder, custom bracket, installation labour and basic RTO paperwork assistance. Premium Italian kits from Lovato or BRC, custom third-row retention brackets and commercial documentation sit at the upper end.

What CNG mileage can I expect from an Ertiga?

The 1.5L K15C returns 21–22 km/kg in the city and 25–26 km/kg on the highway with a light load. With seven passengers, luggage and the AC running, expect 17–20 km/kg. Maruti's claimed factory Ertiga S-CNG figure is 26.11 km/kg.

Can I keep the Ertiga's third row after CNG kit installation?

Only with a smaller cylinder. A 60L or 55L cylinder requires the third row to be folded flat — this is the standard layout for commercial Ertigas. A 45L cylinder in a custom low-profile bracket can sometimes preserve third-row access, but range drops to roughly 220–260 km and the boot disappears. Confirm the layout with your installer before booking.

Does removing the third row affect the RC?

Yes. If the third row is permanently removed or permanently folded to accommodate the cylinder, the seating capacity on the RC must be amended from 7 to 5. For commercial vehicles this is a permit and insurance requirement, not just a paperwork formality. We process it together with the fuel-type endorsement.

Can I install a CNG kit in an Ertiga 6AT?

Yes, and it works well with proper calibration. The torque-converter automatic is sensitive to torque changes, so the CNG ECU must be tuned with live fuel-trim monitoring and the changeover should switch to petrol under hard acceleration. Insist on both a stop-and-go traffic test and a highway incline test before accepting delivery.

Does CNG kit installation in Maruti Suzuki Ertiga void the warranty?

The engine and powertrain warranty is typically voided. Other components generally retain their warranty. If preserving the full factory warranty is essential, buy the factory Ertiga S-CNG VXi or ZXi — but note it is only available with the 5-speed manual.

Which cylinder size is best for the Ertiga?

For commercial use and long-distance work, 60L is the standard and gives the best range. For private use with 4–5 people and luggage, 55L gives a slightly more usable load floor. Only choose 45L if you genuinely need to keep the third row and can live with minimal luggage space.

How long does the installation take?

Typically 6 to 8 hours, including the health check, custom bracket fabrication, fitment, leak test, ECU tuning and road test. 6AT vehicles may take slightly longer because of the additional calibration and road-test time.

How long does the RTO endorsement take?

Private vehicles: 7–30 working days depending on the district. Commercial vehicles: 3–6 weeks, because the alteration involves both a fuel-type change and a seating-capacity change, plus a physical inspection.

Will the Ertiga feel underpowered on CNG?

With 1–4 occupants, barely. With 7 occupants and luggage on a highway incline, yes — you will downshift more than on petrol. This is normal for any CNG conversion on a loaded MPV and is not a sign of a bad installation.

How often does the cylinder need a hydro test?

Every 3 years, as mandated by PESO. This is a legal requirement and also a safety one. We provide hydro-testing as a standalone service, and we can schedule it around your vehicle's duty cycle.

Can I use CNG and petrol interchangeably?

Yes. The changeover switch lets you run on either fuel at any time. Most owners start on petrol and switch to gas once the engine warms up, which improves cold-start smoothness and reducer life. With a 60L cylinder plus the 45L petrol tank, combined range comfortably exceeds 700 km.

Will the CNG kit affect my insurance premium?

Yes. Expect an increase of ₹2,000 to ₹4,500 per year, higher for commercial policies. The kit must be declared and the policy endorsed — and for commercial vehicles, the amended seating capacity must also be reflected.

Is CNG safe in a 7-seater MPV?

Yes, when installed correctly. CNG cylinders are far stronger than petrol tanks — they are tested to extremely high burst pressures. The critical factors are a certified cylinder, a certified kit, a properly fabricated bracket and a professional installation with a documented leak test.

Do I lose the spare wheel?

No. In the Ertiga, the spare wheel is mounted under the rear floor, so it remains accessible after the cylinder is fitted in the boot area. Confirm the layout with your installer before work begins.

20. Book Your CNG Kit Installation in Maruti Suzuki Ertiga Today

Whether you run a private Ertiga with the family, a ZXi+ 6AT, or a fleet of commercial units, we can help you choose the right kit, plan the correct cylinder layout and complete the RTO endorsement — including the seat-capacity amendment where required.