Question about 2004 Chevrolet Malibu

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Had my oil pump & oil sensor replaced yesterday and oil pressure light still comes on. Is it possible the sensor was not reset? Would that cause this? I have a 2004 Malibu Classic with 60,000 miles on it.

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There is an oil pressure switch that is what turns off you light it is located on the block near the oil fliter

Posted on Jul 27, 2009

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What causes the oil light to come on?


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My car has been having issues for six months. The initial message on my car's computer said it was the Oxygen sensor, but I had just replaced that less then 2 years prior, so I didn't believe that....


It is possible that the O2 sensor has become faulty, or out of range, in the 2 years you have had it. It is also possible your Air/Fuel Ratio is off and causing your ECU to think the O2 sensor is out of range. I would try resetting the ECU with a Code Reader/Eraser, and see if the code comes back for the O2 sensor.

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I have previously had all of the above suggested reasons checked with no solution to this problem. My problem is identifying all of the known reasons that can cause the oil light to come-on? Then perhaps I...


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With my passat oil light goes on when i rev my engine


The sensor for the oil is on the bottom of the oil pan. If it turns out to be faulty, you can replace it, but you will need to remove the oil and the oil pan. This is no problem. You may need to remove the sway bar to get to it, this comes off easy. The oil pan will need a new gasket, and a little sealant on it. Tighten them evenly, and not too tight.
If the sensor is OK, then you should check your oil pressure. You can do it with an in-line gauge, or have a shop do a quick check on it. Low oil pressure can be caused by a clogged line or filter, or a bad oil pump. The oil pump is turned by the timing belt, and will take some work to get to.
If the engine is not over-heating, then the oil probably isn't related to the reduced performance. A tune-up could be in order...check & replace if ness. the spark plugs. Use OEM plugs only or it can ruin your ignition coil. Check your plug wires using an OHM meter...each car has a set range of values, like 8,000-10,000ohms. If you don't have the manual, just check for any variance in the plugs, and replace if they are different. The coil can be checked the same way.
Replace air filter. If it is time, replace fuel filter...under car on passenger side by back door. You can run some injector cleaner through the next tank of gas.
That should do. Post again if problem is persistent.
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I just had the same problem on an 04 Sebring with a 2.7L V6. The oil pressure sensor (switch) was the culprit. Several web references that I checked mention that the original sensors have issues with oil leakage, which eventually causes it to fail. The sensor itself is fairly inexpensive..about $15. It is located on the back side of the engine and is only accessible from under the car. Look for a small heat shield held on by three 15mm bolts. It is just to the driver's side of where the exhaust system goes behind the engine. The oil sensor is located under this shield. You will need a 1 1/4" deep socket to remove it. When installing the new sensor, be sure to use a torque wrench. It needs to be tightened to 14 ft/lb. Using more force than that, and you run the risk of damaging the sensor.

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