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Re: oil pressure warning light on my audi a4 2005
The car has entered into fail safe mode. It wil not allow the engine to rev high but allows you only to get to a mechanic or to get some oil into the engine. What's the level like? Is there any trace of leakeage?
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Could well be the sensor/sending unit at fault as Dan states.
Could also be the oil has lost some of its viscosity, become thin and not enough pressure for the sensor to work with.
Had a similar problem with a Citroen some years back was advised to drain the oil, flush the engine out with flushing oil (please read the manufacturers instructions closely) fit a new filter and refill. This worked well for me, also cured a smoking problem from the exhaust.
The oil pressure sender unit is located on the oil filter housing.These do tend to leak at times. The warning light for this switch is a red oil can and a buzzer. Replace the switch. If warning light still comes on, have the oil pressure checked. The oil level sender warning light is an orange oil can with oil level under it. This sender is fitted on the bottom of the oil sump and can leak past the seal. If warning light comes on, check oil level. If ok, check for damage to wiring under vehicle. Senders do some times become faulty.
You need to check your owners manual for the difinition of this light, it may just be the oil change light, or it could be a pressure or oil level light, have you checked the oil level just to be safe?
i think from memory that the oil pressure switch is at the back of the cylinder head, if its not there it will be located just above the oil filter, these switches are very cheep to buy and can be bought from any good motor factors. You are right to suspect the switch, its the first thing to eliminate before bogging your self down with more complicated and expensive problems.