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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Aug 04, 2011 | 2001 Chevrolet Cavalier

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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.

As far as the oil pressure goes, check you oil level and replace your Oil Pressure Sensor. You may also want to check the wiring going to your Oil Pressure Sensor for damage.

It may also be time for a new timing belt. If it has jumped a tooth, it could possibly cause your Air/Fuel Ratio to be off, which may be mistaken for an O2 sensor problem. Even if it hasn't jumped yet, or broken, I would still get a new one on there and maybe even a new water pump and oil pump.

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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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Feb 16, 2010 | 2007 Volkswagen Jetta 2.5 Sedan

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Oil pressure light comes on.message says stop engine now.what are possible solutions.engine has 151,000 miles.i change oil every 3000 to 4000 miles

HI.There are only two possible issue here that will cause this to occur. The first issue will be a failing, or damaged oil pressure switch(sending unit). The sending unit is responsible for transmitting the correct information to the instrument that displays the pressure readings. If there is a wiring issue, or the sending unit has failed, this will cause the oil light to illuminate. In this case, the sending unit must be replaced. Ok, the next issue will be a failed oil pump. This will be the most common issue, in this case, due to the actual mileage on this particular vehicle. A oil pump can fail mechanically(gear failure). This device is not repairable, and must be replaced. The easiest way to isolate the issue, will be to preform a pressure test on the engine. There is a special tool, used by your mechanic, that will allow you, or him, to extract the true pressure readings for the engine, during idle. If the pressure test confirms that the oil pressure is low, or weak, this will lead to a failed oil pump. Now, if the pressure test indicates that the engine is running at optimal pressure range, this will indicate that the oil pressure switch(sending unit), is faulty. It must be replaced.

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Oil light comes on only when at an idle

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.

If this doesn't resolve the problem, you may have a problem with the oil pump either being defective or blocked with sludge. As one of the other gurus on here mentioned, this engine does have a known problem with sludge buildup. I hope this helps! Good luck!

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