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Typically, it would be the oxygen sensor, but you should go to an auto parts store (such as autozone, advance auto, western auto) and they will use a OBD2 handheld scanner to find out why the light is on. This is typically a free service. The " check engine light" is by far one of the most misunderstood technological advances It is a warning light that is illuminated when there is a problem affecting the EMISSIONS of the vehicle.. Don't let it bother you as it is a good thing once you understand it. One point that was brought up a recent meeting of technicians was that the amount of hydrocarbons is greater when the gas cap is left off than when the engine is running. Hydrocarbons are part of pollution emitted as gasoline evaporates. Going a step farther, one facet of the emission system is the "Evaporative" portion. This is when the fumes from the gasoline are leaking from the system into the outside air. This is one part of the emission system that can trigger a check engine light. I would say a small percentage of the vehicles that have a check engine light are the result of a loose or inadequate gas cap. But understand that many scenarios are possible with the "check engine light" The vehicle's powertrain computer (note that some vehicles have multiple computers aside from the powertain computer) will run a series of self-tests. They will only run under certain criteria. And they are different from manufacturer to manufacturer. Some self-tests or

2006-07-18 01:15:55
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Q: What make the check engine light come on on a 1999 Pontiac Grand Am with 101000 miles?
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Why does Check Engine Light comes on after the engine is warm on a 1999 Pontiac Grand Prix?

There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.

What is the oil capacity for a 1997 Pontiac Grand Prix?

1997 PONTIAC GRAND PRIX 3.8L 6-cyl EngineCAPACITIESEngine, with filter..........4.6 quarts [1]1. After refill check oil level.Do not overfill.1997 PONTIAC GRAND PRIX 3.1L 6-cyl EngineCAPACITIESEngine, without filter..........4.0 quarts [1]1. Add extra oil when replacing filter. refill check oil level.Do not overfill.Hope This Helps.

What would cause an engine surge and check engine light on a 1985 Pontiac Grand Am and how do you repair it?

There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.

Why would the Check engine light and no ets light turn on Pontiac grand am?

There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.

1999 Pontiac grand am stalls immediately after starting?

is the computer setting a code or check engine light, if not it could be your crank sensor.

How do you check the carburetor on a 1994 Pontiac Grand Am?

94 grand ams are fuel injected, not carburated. There is no carburetor to check

What is the firing order for a 1990 Pontiac Grand Am?

Check on the engine block or intake manifold of your motor. Most engines are cast with that information right on it.

Reset check engine light on 2000 Pontiac grand am?

Try disconnecting battery for about 10 mins. or have vehicle scanned and codes cleared

Will a vacuum line leak cause your computer in your 1997 Pontiac grand am to mess up?

It might cause the "check engine" light to come on.

How do you reset the check engine light in a 2000 Pontiac grand prix?

after the cause of the code is repaired, you reset with a scan tool, or by unhooking the battery.

Why would a 1998 Pontiac grand am engine stop running randomly We ran a full diagnostic check no codes show?

A bad fuel pump can cause your 1998 Pontiac Grand Am engine to randomly stop running. The fuel pump might be working at times and then at other times not working.

Why would a 2001 pontiac grand am turn over but not start?

Check the 2001 Grand Ams crank shaft position sensor first. If the sensor is bad then the engine will not get fire or start.

How do you reset the Check Engine light on a 96 Pontiac Grand Am?

Disconnect and reconnect the ground cable from the battery or remove and replace the fuse that controls your computer.

Fuses Pontiac Grand Am?

check under the dash by the sterring wheel

How do you check the liquid transmission Pontiac 2000 grand am?

sealed system or not

Pontiac Grand Am wont start?

check your ignition fuse- check your crank senser and wires- when you turn your key on but dont start engine listen for the fuel pump to buzz- check for gas in the fuel rail-check for spark

Why won't 2000 Pontiac grand am start when it's cold?

check and see if your thermostat is stuck open(top of engine block). depending where you live, water could be slushy or frozen in your engine.

Where do you put transmission fluid in a 96 grand am SE engine?

The transmission fluid on a 96 Pontiac Grand Am SE is put into the filler tube on the left side of the engine. It runs directly into the top of the transmission and also contains a dipstick to check fluid levels.

Where is the PVC on a Pontiac grand prix 2000 6cyl 3800 engine?

Check out the following website for pics and instructions. Hope this helps. "G"

How do you get rid of a check engine light on an 2004 Pontiac grand am?

Disconnect the battery from the car for about 10 minutes; If that doesn't work take it to the shop and have the codes read and reset.

If your Pontiac grand am ETS Light and Check Engine light are on but the car runs fine how can you fix?

You need to start by having it checked for codes. Then you will know what to diagnose/fix.