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Check Engine Light - P0301 - Cylinder One Misfire?

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4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCHCheck Engine Light - P0301 - Cylinder One Misfire?

Leading reported evidence

Replace over ten (10) years ago

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster
To my knowledge, Coils are original but spark plugs were replaced over ten (10) years ago.
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Check Engine Light - P0301 - Cylinder One Misfire?

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Leading evidence: 'Replace over ten (10) years ago' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace over ten (10) years ago' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

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1 matching discussions · 4 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace over ten (10) years ago

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster
To my knowledge, Coils are original but spark plugs were replaced over ten (10) years ago.
Original post Read captured discussion
Check Engine Light - P0301 - Cylinder One Misfire?

Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

4 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261027T005001Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi, I recently picked up an 03 C2 with 42K on it. I just washed it and waxed it today and then when I went to start it it was running fine, however, when I let it idle for a little bit, I saw the check engine light came on. So I scanned the car and P0301 was the code. I erased it and decided to ride it around the block and I noticed it was bogging, and the check engine light came back and was flashing. To my knowledge, Coils are original but spark plugs were replaced over ten (10) years ago. Any idea what it is? I decided to order New Coils and Plugs as preventive maintenance based on other threads I saw.

POST 2Original post

I assume before you washed it the car ran fine ? You probably have a cracked coil from thousands of heat cycles . The new coils/plugs " should " fix it .

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 19272228

Car was running fine, just drove it on Wednesday 120 miles, without any issues at all.

POST 4Original post

Nothing good comes from washing a 911 ..... by dousing water all over the rear of the engine.

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