NGK Laser Iridium DIFR6D13 Spark Plug for Honda City, Jazz & India Fitment Guide?

Five Honda models sold in India share the same 1.5L i-VTEC petrol engine and the same spark plug: the NGK DIFR6D13. But Indian owners regularly land on the wrong plug — either by searching the car name without checking the generation, or by confusing the DIFR6D13 with the visually similar IZFR6K-13 used in the older Honda City.

The difference between these two plugs is not cosmetic. One has a 12mm thread. The other has a 14mm thread. Installing the wrong one risks poor seating, combustion gas leakage, and cylinder head thread damage.

This guide gives you everything you need to confirm the right plug and buy correctly.

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In short: The NGK DIFR6D13 (stock number 94167, Honda OEM reference 12290-RB0-J11) is the correct Laser Iridium spark plug for the Honda City from February 2015 onwards (including the BS6 City from 2020), Honda Jazz 1.5L MT and AT, Honda BR-V, Honda WR-V, and Honda Mobilio. All five are 4-cylinder engines — each requires 4 plugs. This plug has a 12mm thread and must not be confused with the IZFR6K-13 (14mm thread) used in the Honda City from October 2008 to September 2014.

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NGK DIFR6D13 — Technical Specifications

Do not re-gap this plug. The fine-wire iridium and platinum electrodes are precision laser-welded components. Adjusting the gap with conventional tools damages the electrode. Install at the factory-set 1.3mm gap.

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Which Honda Models Use the DIFR6D13?

All five models below use Honda's 1.5L DOHC i-VTEC engine with a 12mm thread cylinder head.

Honda City — February 2015 onwards
This includes the 5th generation City from February 2015, and the BS6 6th generation City from 2020. Both use the same 12mm thread cylinder head and require the DIFR6D13.

Honda Jazz — 1.5L MT and AT
Both manual and automatic Jazz 1.5L variants use this plug. The Jazz 1.2L MT uses a different specification — confirm your engine size before ordering.

Honda BR-V — 1.5L petrol
Sold in India from 2016. The 1.5L i-VTEC engine uses the same 12mm thread ignition specification.

Honda WR-V — 1.5L petrol
Built on the Jazz platform, sold from 2017. Same ignition specification as the Jazz 1.5L.

Honda Mobilio — 1.5L petrol
Sold in India between 2014 and 2017. The 1.5L i-VTEC petrol uses the DIFR6D13.

Ready to order? Buy NGK DIFR6D13 spark plugs (set of 4) on AutoDecode — verify your vehicle details before adding to cart.

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DIFR6D13 vs IZFR6K-13 — The Difference That Matters

This is the most important section for Honda City owners. These two plugs share a heat range and gap specification and are sometimes listed together under "Honda City" without a clear generation boundary. They are not interchangeable.

Why the thread size is critical: A 12mm plug installed into a 14mm bore will not seal correctly against the combustion chamber — combustion gases leak past the plug seat, causing heat damage to the plug and potential thread damage to the cylinder head. A 14mm plug will not thread into a 12mm bore at all.

How to confirm which City you have: Check the Month and Year of Manufacture on your RC book.

• October 2008 – September 2014 → IZFR6K-13 (14mm thread)
• February 2015 onwards → DIFR6D13 (12mm thread)

For City models produced between October 2014 and January 2015, confirm your exact production date before ordering.

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How Many Plugs to Order

All five models covered by this guide are 4-cylinder engines. A complete service requires exactly 4 plugs.

Replace all four together. Partial replacement — changing only the cylinder showing a misfire code — leaves older plugs with different wear characteristics alongside the fresh ones. The combustion imbalance this creates often reproduces the original symptoms within a short period. The labour cost of a spark plug service is fixed regardless of how many plugs are changed — replacing all four at once maximises the value of that service.

Order a full set of 4 NGK DIFR6D13 plugs on AutoDecode — one set covers one complete service.

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Symptoms That Indicate Spark Plug Attention Is Needed

Watch for these signs across City, Jazz, BR-V, WR-V, and Mobilio:

• Rough or uneven idle, especially after cold start or extended idling in traffic
• Hesitation or stumble when accelerating from low speed
• Flat throttle response — particularly around the VTEC cam switchover point under acceleration
• Noticeably reduced fuel efficiency compared to your normal baseline
• Hard starting, especially on cool mornings or after the car has sat unused
• Engine vibration at idle that wasn't present before
• P030X misfire fault codes from a diagnostic scan

In an i-VTEC engine, plug wear often appears specifically at the VTEC crossover: the car runs normally at low RPM but stumbles or hesitates when the VTEC switches under harder acceleration. This is frequently misdiagnosed as a VTEC or throttle body issue when the actual cause is a plug with insufficient spark energy under the higher airflow conditions of the high-lift cam profile.

If a misfire code points to a specific cylinder, inspect that cylinder's plug first.

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Indian Driving Conditions and Service Intervals

Most Honda City, Jazz, BR-V, WR-V, and Mobilio owners in India spend the majority of their driving in low-speed, stop-and-go city traffic — conditions where the engine rarely reaches the RPM at which VTEC switches to the high-lift profile. Plugs spend most of their working life under partial combustion load with frequent cold starts.

The DIFR6D13's extended insulator nose helps it reach self-cleaning temperature even under partial-load city operation. However, prolonged low-load driving, a dirty fuel injector causing a slightly rich condition, or excessive idling in traffic can still lead to gradual deposit accumulation over time.

Refer to your Honda owner's manual for the exact replacement interval. Honda's service documentation for these engines generally references Laser Iridium plug replacement at approximately 40,000–50,000 km — but inspect condition earlier if any symptoms listed above appear, or if your driving is predominantly short urban trips.

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Conclusion

The NGK DIFR6D13 (stock number 94167, Honda OEM 12290-RB0-J11) is the correct Laser Iridium plug for five Honda models in India — City from February 2015, Jazz 1.5L, BR-V, WR-V, and Mobilio. Each requires a set of 4. The single most important check before ordering is your Honda City's production date: October 2008–September 2014 requires the IZFR6K-13 with a 14mm thread. February 2015 onwards requires the DIFR6D13 with a 12mm thread.

Buy NGK DIFR6D13 spark plugs on AutoDecode — verify fitment using your vehicle's RC book production date before ordering.
WhatsApp: wa.me/917906442130 | Website: autodecode.in

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4. FAQ Section

Q1. Which Honda models in India use the NGK DIFR6D13?
The Honda City from February 2015 onwards (including the BS6 City from 2020), Honda Jazz 1.5L MT and AT, Honda BR-V 1.5L, Honda WR-V 1.5L, and Honda Mobilio 1.5L. All use Honda's 1.5L DOHC i-VTEC engine with a 12mm thread cylinder head.

Q2. What is the difference between the DIFR6D13 and the IZFR6K-13?
Thread size. The DIFR6D13 has a 12mm thread and fits the Honda City from February 2015 onwards. The IZFR6K-13 has a 14mm thread and fits the Honda City from October 2008 to September 2014. Both have the same heat range and gap, but the thread sizes are physically incompatible — installing the wrong one risks combustion gas leakage and cylinder head thread damage.

Q3. Does the DIFR6D13 fit the BS6 Honda City launched in 2020?
Yes. The BS6 City uses the same 1.5L DOHC VTEC engine family with the 12mm thread cylinder head. The DIFR6D13 is the correct plug.

Q4. How many DIFR6D13 plugs does my Honda need?
Four. All five models covered by this guide are 4-cylinder engines. Always replace the full set together — partial replacement leaves worn plugs alongside fresh ones, creating combustion imbalance that often reproduces symptoms quickly.

Q5. Can I re-gap the NGK DIFR6D13 before installing?
No. The DIFR6D13 is a Laser Iridium plug factory-set to 1.3mm. The fine-wire iridium and platinum electrodes must not be adjusted with conventional gapping tools. Install at the factory-set gap.