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: A check engine light with a computer trouble code or p0420 is a telltale sign, as well as poor acceleration.- TechJK---------------------------------------------------------------

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.

2015-07-15 19:07:48
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Q: How do you know when the catalytic converter is giving out on your 2002 Oldsmobile Alero?
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Related Questions

Can you take the catalytic converter off of an Oldsmobile Alero without causing problems to the car?

no it causes alot of problems

On a 2002 Oldsmobile alero v6 what can be the problem that the transmission shift so hard?

It's probably a problem with your catalytic converter.

How much does it cost to replace a catalytic converter for a 2001 Oldsmobile alero?

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.

What would cause no power on a 2002 Oldsmobile Alero after the spark plugs have been changed?

If the car has high miles, try checking the catalytic converter. If it is clogged it will cause the vehicle to lose power.

What does the code p0140 mean for an Oldsmobile alero?

P= Powertrain 0140= bad oxygen sensor downstream from the catalytic converter. Check wiring first, if no problems with broken wiring replace sensor.

What causes roaring sound underneath 1999 Alero?

I had this problem and tweaked the throttle and replaced the catalytic converter - fixed.

Dash lights on Oldsmobile alero?

brake light on when driving oldsmobile alero

Where is charging port Oldsmobile alero?

Where is the charging port for the a/c in a Oldsmobile alero

What is the fuel tank capacity of an Oldsmobile Alero?

What is the fuel tank capacity of an Oldsmobile Alero

How do you fix the oxygen sensor in Bank 1 sensor 2 of a 2002 Olds Alero?

Replace it. Sensor 2 is the one AFTER the catalytic converter.

How do you replace the head lights on my 1999 Oldsmobile alero?

how do you replace head lights on my 1999 oldsmobile alero?

Security- system for Oldsmobile alero 2002?

how do you fix security switch on a 2002 oldsmobile alero

Where is the radiator cap located on a 2000 Oldsmobile Alero?

Where is the radiator cap located on a 2000 Oldsmobile Alero?

What was the last Oldsmobile ever made?

The oldsmobile alero

How many different models of the Oldsmobile Alero are there?

There are three different models of the Oldsmobile Alero; the GX, the Gl, and the GLX

Where is the fuse and relay for the power window on a 2002 Oldsmobile Alero?

where is the fuse and relay for the power windows on a 2002 Oldsmobile alero

Show me a diagram of starter location on a 1999 Oldsmobile alero.?

Show me a diagram of the starter location on a 1999 Oldsmobile Alero

How much transmission oil do you put in a 1999 Oldsmobile Alero?

7 qts refill for auto trans 13 qts if you drain the torque converter too

What can make a 2003 Oldsmobile Alero use a lot of gas?

Bad plugs and wires, Partially clogged catalytic converter, Bent tail pipe, Clogged air filter, Incorrect weight oil, low tire pressure, driving technique, brakes dragging, just to name a few causes.

When was the Oldsmobile Alero first produced?

Oldsmobile Alero was a very popular compact vehicle produced by the Oldsmobile branch of General Motors. This vehicle was very first produced in April of 1998.

Does a 2001 Oldsmobile alero have a cabin air filter?

where is the cabin filter on a 200l alero

Can you run a 2002 Alero without a catalytic converter?

No. It is illegal, and the oxygen sensors will not function properly. That will cause all sorts of driveabilty issues, low fuel economy is one.

Does a 2004 Oldsmobile alero 3.4 motor fit in a 1999 Oldsmobile alero 3.4l car?

Yes the engine from a 2004 will fit a 1999 body.

What type of transmission fluid is needed for a 2000 Oldsmobile Alero V6?

A 2000 Oldsmobile Alero V6 requires 6.8 quarts of Dexron III fluid.

What was the last Oldsmobile brand?

If you're referring to the last Oldsmobile car produced, it was the Alero.