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Most O2 sensor problems should set a check engine warning; otherwise, the manufacturer would probably be in violation of EPA and CARB regulations.
In older cars, with less sensitive on-board diagnostic (OBD) systems, and unheated O2 Sensors, it may be possible for an O2 sensor to become partially contaminated, and not set the check engine light. In this case, your fuel economy would be degraded slightly, but the vehicle might still meet emissions.
Hence, there would be No check engine light. Aside from the slightly degraded fuel economy, the car would still run normally.
What else can I help you with?
Would a bad oxygen sensor cause a reduced engine power warning on a 2003 Chevy truck?
NO. That means the engine is running too hot. Check cooling system.
How do you check 02 sensor if is good or bad?
If it is bad the check engine light will come on and set a code for that particular sensor.
What does it mean when the yellow comes on shaped like the engine in a 2005 Buick Rainier?
That is a warning light to "check your engine". Visit a mechanic and have them use a computer code reader to check for a trouble code. On a 2005 there is a good chance that you may have a bad sensor, such as an oxygen sensor.
Can a bad 02 sensor cause your engine to make a noise?
Not likely. A bad O2 sensor would illuminate the check engine light and the engine performance would suffer.
How can you disable the check engine light for an o2 sensor?
replace the bad sensor and it will turn off.
Will bad O2 sensor trip the check engine light?
Yes.
Will check engine light come on if map sensor is bad?
yes
My Car cuts out while driving with no warning?
fuel system check engine light on was diagnose as being the fuel sensor now car cuts off while driving What would be the problems? You think maybe the fuel sensor could be bad? It's nice when the check engine light gives you the answer
Can the crankshaft sensor be bad if the check engine light is not coming on?
It could be bad with out turning the light on.
Will a bad knock sensor prevent an engine from shifting?
A bad knock sensor would illuminate the check engine light and allow the engine to ping (spark knock). The engine doesn't shift, the transmission shifts.
Will an bad oxygen sensor make the engine check light come on?
yes
Symptoms of a bad o2 sensor?
The "check engine" light would illuminate.
