Lexus CT200h Spark Plugs: Intervals, Fitment & Warning Signs
On the CT200h, Lexus explicitly states not to adjust the gap on Denso iridium plugs, since the fragile tip can genuinely break or chip.
Illustration for editorial purposes
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OEM Part Number: confirm via engine code — aftermarket Bosch 0 242 129 529 / Denso IXEH20TT
| Petrol engines in this generation | 1.8 hybrid (2ZR-FXE); no engine code is attached to individual plugs |
|---|---|
| Spark plugs (aftermarket) | Denso IXEH20TT (iridium centre, platinum earth, M12x1.25, 26.5 mm reach); Champion CCH9412 (iridium, 1.0 mm gap, M12x1.25, 14 mm hex, 26.5 mm reach); Bosch 0 242 129 529 (1.1 mm gap, M12x1.25, 14 mm hex, 26.5 mm reach); Kamoka 7100053 (iridium, 1.0 mm gap, 14 mm hex); Hella 8EH 188 706-161 (1.1 mm gap, M12x1.25, 14 mm hex); Magneti Marelli 062611000067 (1.1 mm gap, M12x1.25, 14 mm hex) |
| Genuine (OE) numbers quoted | Kamoka 7100053 = 9091901253 |
| Fitment notes | The CT takes a small M12x1.25 / 14 mm hex long-reach iridium plug with a 1.0 to 1.1 mm gap; no NGK reference is listed for this model. No change interval is given. |
Lexus CT200h Spark Plugs: A Cheap Part That Causes Expensive-Feeling Problems
On the Lexus CT200h, spark plug wear tends to creep in quietly — idle gets a little rougher, throttle response softens slightly — the kind of symptoms that get blamed on almost anything else under the bonnet. Given how cheap the part itself is, it's an easy one to put off for longer than makes sense.
Lexus CT200h Spark Plugs: What They Do
Inside each cylinder of the Lexus CT200h, spark plugs ignite the compressed fuel-air mixture, and their condition has a direct effect on combustion efficiency, fuel economy and how smoothly the engine runs. Petrol engines can't function without them; diesels don't use spark plugs, relying on compression alone to ignite fuel.
Lexus CT200h Spark Plugs: Generations & Spark Plug Count
| Diesel variants, where fitted | Not applicable — diesel engines use compression ignition and have no spark plugs at all |
|---|---|
| Petrol variants (all trims) | 4 spark plugs — one per cylinder |
Lexus CT200h Spark Plugs: Watch: Replacing It
Alternatives: jlYnPlhAoTo, DFGLlH_6zpM.
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A Genuinely Important, Official Instruction Worth Knowing — Lexus CT200h Spark Plugs
This is genuinely worth knowing before fitting Denso iridium spark plugs: Lexus explicitly states not to adjust the gap on these plugs during installation, since the iridium tip is genuinely fragile and adjusting the gap risks breaking or chipping it.
It's also genuinely worth knowing a useful diagnostic technique: swapping coil packs between cylinders and seeing whether the misfire code follows the coil can help confirm whether a specific coil is genuinely at fault.
Lexus CT200h 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 Lexus Spark Plugs
The same part, covered across other Lexus models.