Renault Megane Spark Plugs: Intervals, Fitment & Warning Signs
On the Megane, a genuinely overlooked cause worth checking if coils and plugs haven't fixed a misfire: poor earth leads.
Illustration for editorial purposes
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OEM Part Number: confirm via engine code — aftermarket NGK 90061 / Bosch 0 242 140 565
| Petrol engines in this generation | 1.0 TCe 114 HP (B9MD, B9MW), 1.2 TCe 130 HP (B9MR), 1.2 TCe 100 HP (B9MS), 1.3 TCe 102 HP (B9N8), 116 HP (B9N9), 140 HP (B9NB), 158, 159 and 163 HP (B9NC), 1.6 16V 115 HP, 1.6 TCe 165 HP, 1.6 TCe 205 HP (B9MV), 1.8 RS 300 HP (B9M8), 1.8 RS TCe 279 HP (B9M6); hybrid 1.6 E-TECH 160 HP (B9NH) |
|---|---|
| Spark plugs (aftermarket) | NGK 90061 (iridium, 14 mm hex, M12x1.25); NGK 91121 (iridium, 14 mm hex, M12x1.25); NGK 95003 (iridium, 28.5 mm reach); Bosch 0 242 140 565 (0.7 mm gap, 14 mm hex); Bosch 0 241 140 537 (0.7 mm gap); Bosch 0 242 129 510 (0.9 mm gap); Denso VFXEHC22G and IXEH22TT (iridium, platinum earth, M12x1.25); Champion OE261 (iridium, 0.7 mm gap) |
| Genuine (OE) numbers quoted | Kamoka 7100015 cross-references 22401-00Q0K; Kamoka 7100016 cross-references 22 40 191 33R; Denso K20PR-U cross-references 5960.F0; Denso K20TT cross-references 1WT318110 |
| Fitment notes | The turbo TCe engines take iridium plugs at about 0.7 mm gap with M12x1.25 thread and 14 mm hex; the M14x1.25 (16 mm hex) nickel and iridium plugs listed are for older or non-TCe engines. No change interval is shown. |
A Genuinely Overlooked Cause Worth Checking: Earth Leads — Renault Megane Spark Plugs
If you've already replaced coils, plugs, and leads without success, this is genuinely worth knowing: an experienced mechanic's account describes having to replace earth leads on numerous Renaults over the years, causing a genuinely wide range of seemingly unrelated symptoms — lights dimming, the engine not starting first time, running badly, or randomly cutting out, in addition to misfiring. A genuinely simple, practical test worth trying: temporarily attaching a jump lead directly from the engine block to the battery's negative terminal can rule earth issues in or out.
It's also worth knowing that oil seeping past the rocker cover onto the spark plug wells or coil connections, then combining with rainwater, is a genuinely common and specific cause of intermittent misfiring that worsens in wet weather — worth checking and cleaning this area thoroughly, and addressing any underlying rocker cover gasket leak.
Renault Megane Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems
Worn spark plugs on the Renault Megane rarely announce themselves clearly — a slightly rougher idle, a bit less punch off the line — symptoms easy to blame on almost anything else in the engine bay. The part itself costs very little, which makes it an easy one to overlook for far longer than it should be.
Renault Megane Spark Plugs: Watch: Replacing It
Megane 4 (RS Trophy 1.8 turbo variant)
Renault Megane Spark Plugs: What They Do
The Renault Megane's spark plugs ignite the compressed fuel-air mixture inside each cylinder, and their condition directly affects combustion efficiency, fuel economy and smooth running. Petrol engines rely entirely on them; diesel engines don't use spark plugs at all, relying on compression instead.
Renault Megane Spark Plugs: Generations & Spark Plug Count
| Diesel variants | Not applicable — diesel engines use compression ignition and have no spark plugs at all |
|---|---|
| Petrol variants (all trims) | 4 spark plugs — one per cylinder |
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Renault Megane Spark Plugs: Warning Signs, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Spark Plugs Guide for symptoms of worn plugs, why matching your exact plug specification matters, and trusted brands to buy from.
More Renault Spark Plugs
The same part, covered across other Renault models.