Question about 2005 Chevrolet Cobalt

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I changed my oil, but my oil gauge is not reading 100%.

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It Should Read about 70 80 PSI @ 2500 RPM's If Not Sending Unit (SENSOR) Is Faulty

Posted on Jul 12, 2009

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Has 358000 miles, just had leaks repaired. Twice since my oil pressure gauge reads no pressure but not all the time? Why


1. Oil Pressure Gauge Not Working You will notice this happens when your oil pressure gauge is not reading, whether the engine is turned off, idle or running. Try to step on the gas to rev up the engine. If the oil pressure gauge still doesn't change its reading, your gauge is busted. It's best to replace it as soon as possible because you won't have any idea if your car is already overheating or not.
2. Oil Pressure Gauge Reading Too Low When your engine is idle, the oil pressure gauge will have a low reading. When the engine starts running or when you're already cruising or on the freeway, your gauge's reading should have increased. If it stays on a low reading, then you now your oil pressure gauge is broken.
3. Oil Pressure Gauge Reading Too High Another common oil pressure gauge problem is when your oil pressure gauge is reading too high when your engine is idle or when it's turned off. Rep

Oct 24, 2015 | 2001 GMC Yukon XL

1 Answer

Does 50 percent oil life means half low or need oil change


Some vehicles have a reading that starts at 100% and Counts down to ZERO. If your gauge is telling you that you are at 50% life, then you have 1,500 to 2,500 miles left before your engine oil change. This is ONLY as good as the last time you changed your Oil and someone RESET IT...

If it was not reset, follow the Tag on your Windshield

Apr 07, 2013 | 2000 Cadillac DeVille DTS

2 Answers

My oil pressure gauge (on the top right of the dashboard) randomly shows the oil pressure going down to zero (check gauge light comes on) and then randomly goes back into the normal range. It happens...


Did you compare what your dash gauge read when it was acting up and compare it to the manual gauge at the same time? I know you said you used the manual gauge and it read fine so if you get a proper reading out of the manual gauge and an improper reading out of the dash gauge then your dash gauge needs addressed.

Mar 20, 2011 | 2002 Jeep Grand Cherokee

1 Answer

I may need a new oil sender/switch for my Capri XR2. My mechanic can't find the OEM one, it's discontinued. I have found some aftermarket ones with a range of 15-100 PSI. I read that operating pressure is...


I myself would go for the pressure sensor, should be located either on the side of the block or on the side of the side of the oil pan. If you're concerned about the reading, the aftermarket sensors you mentioned should work just fine.

May 30, 2010 | 1991 Mercury Capri

1 Answer

Oil Change - Computer Reading


Tech did not reset. if you have steering wheel controls scroll thru till you get to oil percent and hold down the reset button this is the arrow looking button. hold til it says oil life reset

Mar 26, 2010 | 2005 Chevrolet Tahoe

2 Answers

Oil pressure gauge reads normal when first starts. as it warms up, gauge goes to zero. If I rev engine, gauge goes back to normal.


Two things...when it reads zero, is there any engine noise (tapping or knocking)? After you rev the engine does the pressure read normal at idle and function normally, or does it go back down? Either way, you should not drive the vehicle 'till you have a mechanical gauge (yours is electro-mechanical) put on there and the actual pressure is tested. The condition may be a bad sending unit, a bad bearing or possible obstructed oil pump screen. The repair is obviously different for each one and the price is as well.

Oct 20, 2009 | 2002 Jeep Grand Cherokee

2 Answers

Reset oil gauge after oil change


ignition on, hit the gas pedal 3 times the third hit you hold down and wait 5 seconds...you should see 100% on the dash. and its done GOOD LUCK!

Apr 25, 2009 | Chevrolet Blazer Cars & Trucks

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