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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHWhat's your oil pressure reading when engine is OFF? ***Update with photo
Leading reported evidence
Replace sender
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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.
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1
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What's your oil pressure reading when engine is OFF? ***Update with photo
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Leading evidence: 'Replace sender' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'oil pressure sender is shot ('03 c2 coupe)' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check connections at the sending unit' (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.
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 suspect a cause
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suspected cause · Original poster
I suspect my oil pressure sender is shot ('03 C2 coupe).
What's your oil pressure reading when engine is OFF? ***Update with photo
Check connections at the sending unit
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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 contain suggestions
1
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Suggestion
Check the connections at the sending unit and replace if necessary.
What's your oil pressure reading when engine is OFF? ***Update with photo
Use 5w-40 motul excess and want
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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 contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion · Original poster
In fact, I used 5w-40 Motul Excess and want to see if the engine will burn less oil.
What's your oil pressure reading when engine is OFF? ***Update with photo
Use wrong oil
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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 contain suggestions
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.
What's your oil pressure reading when engine is OFF? ***Update with photo
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.
10 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: 20261026T144035Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I suspect my oil pressure sender is shot ('03 C2 coupe). My oil pressure reads 0.5 bar to 2 bar or anywhere in between in the morning or after shut down, when the engine is not even on! Also, it pegs at 5 bar when rev > 2,200 rpm. It wasn't like that before.
Also, the other day while cruising on the highway, the oil pressure went to zero and the oil pressure warning light came on the OBC. Stopped the car and restarted, everything was fine. The car drives normally.
Any thoughts?
*** Update ***
Dealer replaced the sender. Photos of the new sender unit. You can see the exposed terminals, which are prone to oxidation. Why every other connectors are protected but not these??!
You are obviously using the wrong oil. The Porsche fill is way too light (read water).
Try 20w-60 and you should see a full "5" on the pressure gauge (even with the car off).
sorry, I couldn't resist. The guage should not read .5 to 2 when off and it should not read 5 at 2,000 rpm
Check the connections at the sending unit and replace if necessary. You should have no oil pressure reading when engine is not running. A bad ignition switch can cause the same symtoms.
Ray: LOL. In fact, I used 5w-40 Motul Excess and want to see if the engine will burn less oil. The answer is no, unfortunately
1999: Thanks. I could see some corrosion on the termial (screw type and no rubber gromet to protect them from the elements! Don't know what the P engineers were thinking! All the other connectors have plastic/rubber cover to protect them except these!!
Nashat: The oil pressure increases with the rpm and that's normal
I have heard that in many GM cars, the oil pressure gauge is for looks, its either on or off, never moves unless there is gauage issues or sending unit issues, lol!
