Oil pressure too low

CONNORSKY

MEMBER
2005 CITROEN C4
1.4L
TURBO
2WD
MANUAL
837,400 MILES

Hello, I hope you guys can help me out, I am a Citroen owner, I have the "stop" light come on the dashboard, and it says oil pressure too low. I have taken it to four garages, to date it has had; a new oil filter, a new oil sensor switch, an oil change w5-30 fully synthetic oil, the sum removed and cleaned also the sieve
a manual oil gauge test. The turbo tested, a new oil pump, all parts were purchased from Citroen, but still have the problem. Please if anyone can help me please let me know. The oil level is spot on, no leeks, thanks
Regards, Edwarde,
I hope you guys can help me out.

5 Replies

STEVE W.

MECHANIC
12,963 POSTS

Did the manual gauge show low oil pressure? If the manual gauge showed correct oil pressure but you still get the warning it could be bad wiring from the pressure sender to the computer. If the gauge showed low pressure then it would be worn bearings that have excess clearance or another internal problem that is dropping the pressure.

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Wednesday, May 10th, 2017 AT 11:09 AM

CONNORSKY

MEMBER
8 POSTS

Thanks Steve, I will need to ask the mechanic.I would of assumed it was okay as he put the oil pump in after the check. In the mean time how can I check to see if the wiring is bad?
Thanks again, Ed

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Wednesday, May 10th, 2017 AT 11:34 AM

CONNORSKY

MEMBER
8 POSTS

Hi Steve, I have spoken to the mechanic, he said the oil pressure was high, he also said if I start the car and take the oil top off it will throw the oil out, I would see it lashing about, that also shows good oil pressure, he said it is a fault with the wiring from the switch to the ECU. Could I check that myself? Regards, Ed

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Thursday, May 11th, 2017 AT 3:45 AM

STEVE W.

MECHANIC
12,963 POSTS

Wiring should not be difficult to check. You know where the sending unit is, just follow those wire colors to the ECU. Disconnect the battery and test the wires for continuity. You will need a wiring diagram to make sure that the wires do not feed through something else but most of these type units are only a variable resistance or if it is only a light they are a simple switch. One side goes to ground, the other to the ECU.

Your vehicle was not sold in the US so I do not have a good diagram for it. Sorry. I see quite a few online that you can buy that cover your vehicle though.

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Thursday, May 11th, 2017 AT 4:12 AM

CONNORSKY

MEMBER
8 POSTS

Thanks Steve. I will look at that, hopefully I can get it sorted. I will let you know how things go. I just need to get a wiring diagram downloaded and obviously the location of the ECU. Regards, Ed