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check engine light and oil pressure to zero and back

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6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHcheck engine light and oil pressure to zero and back

Reported or suspected cause

misfires

Reported cause

No successful repair reported for this finding.

1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context

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 report identifying a cause
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.

Reported cause · Original poster

Daily garaged and well maintained 2003 C4S has 51k....daily driver......the check engine light was caused by misfires, so the ignition coils were inspected and replaced and the loss of oil pressure was the replacement of the oil pressure sending unit......losing some faith in the car, but still have the CPO warranty for another year.....last 2 months has been rough with 4 trips to the dealer.......Thank God...warranty repairs and I have paid nothing, nada.....repairs include...

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check engine light and oil pressure to zero and back
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Leading evidence: 'misfires' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'misfires' (1 discussions; 1 report identifying it and 0 suggest it). 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 · 6 captured posts examined · 0 partial discussions

Reported and suspected causes (1)

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

misfires

No successful repair reported for this finding.

1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying a cause
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.

Reported cause · Original poster

Daily garaged and well maintained 2003 C4S has 51k....daily driver......the check engine light was caused by misfires, so the ignition coils were inspected and replaced and the loss of oil pressure was the replacement of the oil pressure sending unit......losing some faith in the car, but still have the CPO warranty for another year.....last 2 months has been rough with 4 trips to the dealer.......Thank God...warranty repairs and I have paid nothing, nada.....repairs include...

Original post Read captured discussion
check engine light and oil pressure to zero and back
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.

6 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.

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

Outcome without a verified action link

Glad to hear it was something relatively minor and that they got it fixed!

Original post Read captured discussion

No unique explicit quoted action; no causal link assigned

Generation: 20261027T022239Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Engine light came on week ago for a day...disappeared for a week......oil failure light/symbol came on twice today and oil pressure shot down to zero,paused, shot back to 5 paused, back to zero and paused.....happened 4 times.......started car again.....no warning lights......any comments......or similar experiences....going to dealer tomorrow......

POST 4Original post

would like to hear the outcome from the dealer visit. i have had something similar occur very irregularly over the past few months. i have a 03 C2 with 23,000 miles, 10,000 of which i have put on since purchasing her 15 months ago. never see a change in the coolant temp when the oil pressure indicator drops so i am assuming loose connection or oil pressure sending unit. i'm going to wait for next service and have it dealt with then unless the result of your dealer visit concerns me.

POST 5 / ORIGINAL POSTEROriginal post

Daily garaged and well maintained 2003 C4S has 51k....daily driver......the check engine light was caused by misfires, so the ignition coils were inspected and replaced and the loss of oil pressure was the replacement of the oil pressure sending unit......losing some faith in the car, but still have the CPO warranty for another year.....last 2 months has been rough with 4 trips to the dealer.......Thank God...warranty repairs and I have paid nothing, nada.....repairs include... replacement 2 catalytic converters - $ 2,600 replacement O2 sensor on exhaust system - $ 50 oil pressure sending unit - $ 69.00 replacement 6 ignition coils - cracked wires - unusual at that mileage - $ 500 Would have cost me about $ 4,000 with labor at $125.00 per hour.......

POST 6Original post

Quotes source post: 4669664

Glad to hear it was something relatively minor and that they got it fixed!

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