1) The exhaust smells like rotten eggs/sulfur...a sure sign.
2) A check engine light. This is because the 2nd O2 sensor (behind the cat) would detect unburned gases in the mixture (ie: the cat isn't getting hot enough).
My 2002 starting running very sluggish. No pep on acceleration. Also overheated. Thought it was the transmission not shifting. No warning lights came on. Got a great mechanic who suspected it, dropped the exhaust pipe and smelled the rotten eggs. If your's goes sluggish, get this checked immediately. You could blow your engine.
no it causes alot of problems
It's probably a problem with your catalytic converter.
one for my alero was quoted at around $500. I just cut mine off and welded in a piece of pipe, car has way more power and operates way better.
If the car has high miles, try checking the catalytic converter. If it is clogged it will cause the vehicle to lose power.
P= Powertrain 0140= bad oxygen sensor downstream from the catalytic converter. Check wiring first, if no problems with broken wiring replace sensor.
I had this problem and tweaked the throttle and replaced the catalytic converter - fixed.
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Replace it. Sensor 2 is the one AFTER the catalytic converter.
The oldsmobile alero