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If the check engine light is turning on, the computer has detected a fault and has a code for you to read. The code will tell you what the computer has detected. You can borrow, rent or buy a code scanner at most auto parts retailers. One common scenario is that the engine is given a little more fuel while it's warming up. During that time the throttle body is opened a little extra to allow for a slightly higher idle speed, and the EGR valve is closed or nearly closd. After the engine is warmed, everything goes back to "normal", the amount of fuel is reduced to a more fuel conserving level and a small amount of exhaust gas is recycled into the intake to keep the valves from burning from that lower fuel level. If the EGR valve is plugged or is not functioning properly, the engine will have difficulty idling after the engine warms up. You should be able to verify that through a diagnostic code.
What else can I help you with?
Getting a oxygen sensor code changed sensors reset code code came back on whats goin on?
Wiring, computer, or engine mechanical problem.
Why does the check engine light still come on after the gasket was changed?
Did you reset the light? I don't know what gasket you changed, but undoubtedly that was not the problem. The check engine light comes on when there is a problem with the emissions system.
Engine diognostics test says 0'2 sensors are not heating causing dash light to stay on but they have been changed 3 times any suggestions?
Then it is obvious that the oxygen sensor is not the problem. Quit throwing money at the problem and take it to a professional who knows how to find the real problem.
You have a 2000 Daewoo Lanos with auto trans shifting problem after warming up to operating temp have frequently changed filter and oil no metal in trans don't think trans is problem any ideas?
Do you have a check engine light. I have had problems with my 01 Lanos and the check engine light came on and it was the oxygen sensor so that may be your problem
2003 gmc Yukon check engine light comes on what could be the problem?
changed battery engine light stays on
Whats up 2002 Toyota sienna check engine light is lit runs good sounds good drives good no obvious loose or damaged hoses wires fluids good gas cap seal looks good no blown fuses?
argudfhnrtfhionrsthionoftghn pooooo I have this model vehicle with the same problem. My friend has a code reader which states my engine light is related to an emissions problem. We are going to change out the front oxygen sensor to see if this fixes the problem. There is a rear oxygen sensor that is harder to get to or there may also be a problem with the catalytic converters (expensive). Will let u know if the front oxygen sensor replacements worked
How many miles can be done on a Mazda rx8 rotary engine before it has to be changed?
I have a friend with 170,000 miles and he still drives it daily, I have another friend replacing his engine at 50,000 miles.
Why does my 1995 Saturn drives slow uphill?
You probably have a 4 cylinder engine (A.K.A. the V4 Engine), V4 engines aren't very powerful, I previously had a V4 and I had the same problem.
Why is the check engine light still on in a 95 Mercury Mystique after you changed the alternator and the battery?
Check engine light usually indicates a problem in the emission control system - have vehicle scanned to determine the problem
When should you replace your oxygen sensor on a GMC Envoy?
It is only necessary when the computer recognizes a problem with it. You will have a check engine code. Mine triggered a code " low output " for about 6 months before I changed it, it was still operating ok and not affecting engine performance but the minor fault was picked up by the computer.
How do you know when oxygen sensor is not working?
The computer will tell you. If you have a "check engine" light, connect a code scanner to see what the computer has detected. If there is a problem with the oxygen sensor the code scanner will display the appropriate problem code.
Will my check engine light turn off automatically when you replace the oxygen sensor?
It will after a drive cycle, if that was the original problem.
