Citroen C4 Picasso Spark Plugs: Intervals, Fitment & Warning Signs
On the C4 Picasso, a genuinely distinctive cause worth checking for a stubborn misfire: water leaking through the washer seal can short a specific injector.
Illustration for editorial purposes
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OEM Part Number: confirm via engine code — aftermarket NGK 97434 / Bosch 0 242 145 607
| Petrol engines in this generation | See the fitment notes |
|---|---|
| Spark plugs (aftermarket) | NGK 97434 (iridium, M12x1.25, 14 mm); NGK 97968 (iridium, 14 mm Bi-Hex); NGK 91874 (iridium, gap 0.8 mm, 14 mm); NGK 91530 (platinum, 14 mm Bi-Hex); Bosch 0 242 145 607 (gap 0.8 mm, 14 mm); Bosch 0 242 140 543 (gap 0.75 mm, 14 mm); Bosch 0 242 145 535 (gap 0.75 mm, 14 mm); Champion OE268 (iridium, gap 0.75 mm, 14 mm Bi-Hex) |
| Genuine (OE) numbers quoted | Denso VXUH22I = A0041592503; Kamoka 7090014 = 12 12 0 034 677; Kamoka 7090013 = 0 034 098 |
| Fitment notes | Almost everything is the M12x1.25, 14 mm hex family; a few 16 mm M14x1.25 Bosch plugs (0 242 229 797, 0 242 236 577, 0 242 232 515) are also listed, so confirm by engine. Plugs are not tied to engines and no change interval is shown. |
A Genuinely Distinctive Cause Worth Checking: Water Ingress Through the Washer Seal — Citroen C4 Picasso Spark Plugs
If you're chasing a persistent single-cylinder misfire that hasn't responded to a new coil pack or plugs, this is genuinely worth knowing about: a documented pattern on this platform links water leaking through the windscreen washer reservoir seal to shorting out the nearest fuel injector, causing exactly this kind of stubborn, single-cylinder misfire. A genuinely useful diagnostic clue worth checking directly: if you remove the spark plugs and one specific plug looks noticeably darker or wetter than the others, this points toward that specific cylinder's injector being affected by moisture rather than a generic ignition fault.
If you're testing a coil pack directly, one documented method involves lightly spraying water on the coil while the engine is running and watching for visible arcing, which would confirm a breakdown in the coil's insulation — worth approaching this test with appropriate caution given it involves water near live electrical components.
Citroen C4 Picasso Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems
On the Citroen C4 Picasso, symptoms of worn spark plugs are subtle by nature — a touch rougher at idle, a little less responsive off the line — and easy to attribute to almost any other engine gremlin. Because the part itself is so cheap, it's routinely overlooked well past when it should've been changed.
Citroen C4 Picasso Spark Plugs: Watch: Replacing It
Likely Xsara-era Picasso, not the 2013 car; nothing specific to the 2013-2018 petrol found
Citroen C4 Picasso Spark Plugs: What They Do
How well the Citroen C4 Picasso's engine runs, how efficiently it burns fuel, and how smooth it feels are all tied to spark plug condition, since these ignite the compressed fuel-air mixture in each cylinder. That's a petrol-engine job specifically — diesels ignite fuel through compression and have no spark plugs at all.
Citroen C4 Picasso Spark Plugs: Generations, Engines & Spark Plug Count
| Diesel variants (BlueHDi) | Not applicable — diesel engines use compression ignition and have no spark plugs at all |
|---|---|
| 1.2 PureTech/THP (standard petrol trims) | Genuinely only 3 spark plugs — this engine is shared across the wider PSA/Stellantis range (Peugeot, Citroen, DS), not a four-cylinder |
| GTI/GT (1.6 THP, where fitted) | 4 spark plugs — the performance derivative uses a genuinely different, larger four-cylinder engine from the standard car's 3-cylinder unit |
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Citroen C4 Picasso 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 Citroen Spark Plugs
The same part, covered across other Citroen models.