6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHOil Pressure gauge fault
Reported or suspected cause
tie up
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
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0
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Suspected cause · Original poster
Measuring the voltages at the cables going to the switch I get 12v on Green/Yellow and 7v on Green/Red which I suspect tie up with that, the 12v line being for the dash oil pressure warning light which seems to work as it should.
Leading evidence: 'tie up' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'tie up' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check actual voltage pretty easily' (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.
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Suggestion
Yes it is basically a voltmeter, you can get at the corresponding wire around the back of the instruments to check the actual voltage pretty easily.
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Suggestion · Original poster
If you turn on the ignition (reading 4 bar) and disconnect the switch it drops to rest position, reconnect the switch and there is no response.
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Suggestion · Original poster
If you turn on the ignition (reading 4 bar) and disconnect the switch it drops to rest position, reconnect the switch and there is no response.
Replace although you will need a crows foot spanner
Suggestion or failed attempt
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Unsuccessful attempts
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Discussions
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Suggestion
Sounds like a sender fault, it's pretty easy to change although you will need a crows foot spanner.
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tie up
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect a cause
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Suspected cause · Original poster
Measuring the voltages at the cables going to the switch I get 12v on Green/Yellow and 7v on Green/Red which I suspect tie up with that, the 12v line being for the dash oil pressure warning light which seems to work as it should.
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.
911uk: 1 discussions
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Generation: 20261026T061123Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi all, I have an unusual issue with a new to me 996.1 Cab.
The oil pressure gauge isn't working as it should.
With the ignition off it reads at just over 4 bar.
Turn the ignition on and it stays at 4 bar
Start the engine and it drops to needle rest position
Turn off the engine and it rises back to 4 bar
If you turn on the ignition (reading 4 bar) and disconnect the switch it drops to rest position, reconnect the switch and there is no response.
I believe the gauge is just a voltmeter as such so this would indicate there is a short providing current to the guage with the ignition off, this may also explain why the battery goes flat after 3 days (or it could be a weak battery)
Anyone experience this before?
Yes it is basically a voltmeter, you can get at the corresponding wire around the back of the instruments to check the actual voltage pretty easily. I have the voltage / pressure readings for it at home, but can't get them for a couple of days.
MC
Sounds like a sender fault, it's pretty easy to change although you will need a crows foot spanner. See here:
http://www.911uk.com/viewtopic.php?t=136008&highlight=oil+pressure+sender
I did mine from underneath and it probably took less than 30 mins including jacking the car onto axle stands.
From looking at the wiring diagram would I be correct in assuming (12v) current is provided from within the dash through the gauge and then down to the sensor.
The sensor then provides a variable resistance route to earth depending on oil pressure. :?:
If it is the same as the temperature sensors, which I can't remember off the top of my head, then the dashboard provides 5v through an internal pullup resistor to the sensor.
MC
Measuring the voltages at the cables going to the switch I get 12v on Green/Yellow and 7v on Green/Red which I suspect tie up with that, the 12v line being for the dash oil pressure warning light which seems to work as it should.
Both of these voltage revert to 0 with the ignition off.
In essence I have a voltage incorrectly passing through the gauge and to earth when the ignition is off. This voltage is then cut off or cancelled out when the engine is running.
I can't see how it would be the sender although I wish it was as I love an easy fix!
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