Question about 2003 Oldsmobile Alero

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Trouble code P0303 for 99 aurora

Check engine light blinks and check charge system on display

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PO 300 codes are cylinder misfires

The 3 at the end of 303 is cylinder nunber 3

On some vehicle systems when a MIL Lamp flashes
it indicates that the misfire is so bad that it could damage
the exhaust converter

So you should not use it until you have it diagnosed

Won't be a spark plug issue
It is an ignition coil problem,but why
you need to find out.

Posted on Jun 09, 2012

  • Anonymous Jun 09, 2012

    With the charge system involved,then the alternator
    or battery may come into the mix,even before you
    get to solving the misfire or they are part of the problem



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Posted on Jan 02, 2017


Jamie Heppner

  • 111 Answers

SOURCE: check charging system light on 1995 olds aurora

Usually its your alternator, the light comes on when your charge voltages drops below a certain level.

Posted on Jan 07, 2009



  • 432 Answers

SOURCE: Self-diagnosis System

Autozone Chilton manual or they do this for free

Posted on Oct 03, 2009


  • 1 Answer

SOURCE: 2001 Olds. Aurora with a check engine light on.

Take it to a auto parts store they,ll test it for free and can probaly tell you exactly whats wrong.Probably a sensor or something.

Posted on Oct 16, 2009


  • 359 Answers

SOURCE: How to get 2001 Oldsmobile Aurora to pass

the EGR pintle is most likley clogged with carbon try cleaning it first if that does not solve it then replacing it will

Posted on Dec 15, 2009


Chris Busby

  • 1033 Answers

SOURCE: 2003 olds aurora charging system low volts

The alternator is most likely the problem, it isn't putting out enough of amps to charge the battery, but enough to keep it going which won't last long. Before assuming the battery or alternator, try your battery connections for corrosion or tightness. If you live close to an auto parts store they can check the battery and alternator to see which is the problem. The battery will not hold up long if running lights at night or other power consuming things.

Posted on May 01, 2010

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Check charge system

Your car would say "check charging system" only if your car was having charging problems. A car's alternator recharges the car's battery with electrical energy produced by the gasoline engine. It therefore recharges when the engine is running. You may be having trouble with the battery not performing like it used to. While this is likely because of sulfation on the battery's metal plates, it could be the alternator. To pin it down to the alternator, you'll need to run a series of tests.

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A blinking light, like a "service engine soon immediately" light?
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1 Answer

Trouble with 98 aurora transmission

With all the problems you are having,I would check my charging system and battery connections.Also check for bad body to frame,to engine grounds.Look for a ground wire not to be connected to the engine somewhere.

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1 Answer

Check charging system light on 1995 olds aurora

Usually its your alternator, the light comes on when your charge voltages drops below a certain level.

Jan 07, 2009 | 1997 Oldsmobile Aurora

1 Answer

Oil level system

It may seem obvious but do not operate the engine with it overheating as this can lead to more trouble including a cracked engine block.

Low engine oil pressure is a problem because if it exists, the critical engine parts may not get lubricated properly and may fail. Since you have ruled out external leaks, here are some possibilities:

Clogged oil filter or obstruction in the system

Loose wire or faulty oil pressure or oil level sending switch/sensor.

Possible blown head gasket. This is a serious problem that might be accompanied by white or blue exhaust smoke and a burnt coolant or oil odor. Check for oil contamination with coolant. The dipstick may show a brown milky film/sludge or smell like burnt coolant indicating contamination.

Engine oil pump is possibly bad. This is a serious problem. It's usually time to swap out or rebuild the engine, particularly if it has many miles.

Possible but unlikely in this case is a problem with PCU (Power Control Unit) that runs the Information Center. PCU problems are often indicated by getting other unrelated errors on the info display or "DATE NOT AVAILABLE" for extended periods when you start the car.

You did not mention the Check Engine/Service Engine Soon light being on, but if so I would get the trouble codes read at the OBD II connector. The codes might indicate a sensor problem. Some auto stores do this for free. Either way, I would assume the worse case scenario (bad oil pump) and address it immediately. Unfortunately, due to the complex nature of the car, most things are not easy to diagnose and repair by the do-it-yourselfer. Hopefully though it is just a sensor but with a temperature rise, I would be careful.

Best of Luck!


1996 Oldsmobile Aurora
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