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Old 07-14-2008, 06:52 PM   #11 (permalink)
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It could also be an exhaust leak (or a wonky o2 sensor).

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Old 07-14-2008, 06:55 PM   #12 (permalink)
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I took it to the local Schuck's auto parts store. They were kind enough to read the code for me. The code was P0420, " catalytic system efficiency below threshold (Bank 1)". So there it is ladies and germs. I guess I need a new cat. Wonder what that feline will set me back.
$70-ish I think it was for the one on our GMC Jimmy. They cause hell on a motor when they do kick the bucket.

How many miles on your car btw?
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Old 07-14-2008, 10:21 PM   #13 (permalink)
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I have that code all the time. Oh wait................


The code will not effect driveability, but to stay legal, I would replace the cat. I bought one for mine used for $50.00, but never put it on yet.
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Old 07-15-2008, 11:09 AM   #14 (permalink)
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I guess I'm gonna be a regular at my local wrecking yard. I had to pick up a couple of rims from them. My Metro came with some bent ones.
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Old 07-16-2008, 01:15 PM   #15 (permalink)
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Gassed up my Metro yesterday and the "service engine soon" light went out and has not come back on. Go figure
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Old 07-21-2008, 11:06 AM   #16 (permalink)
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Good for you joan! The "Service Light" is different from the "Check Engine" light on most vehicles, but learning to reset them on different vehicles can be a real pain.

Hope to see you around more often
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Old 07-21-2008, 06:49 PM   #17 (permalink)
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Just FYI, my Firefly #1 had the same code.

The previous owner replaced the cat several months before I got the car, but the light came back within a few months.

When I got the car, a little digging revealed the root cause was an old O2 sensor which was permitting a rich condition and higher cat temps (fuel burning on the catalyst). That's what killed them.
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Old 07-21-2008, 07:46 PM   #18 (permalink)
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Originally Posted by MetroMPG View Post
Just FYI, my Firefly #1 had the same code.

The previous owner replaced the cat several months before I got the car, but the light came back within a few months.

When I got the car, a little digging revealed the root cause was an old O2 sensor which was permitting a rich condition and higher cat temps (fuel burning on the catalyst). That's what killed them.
I still maintain that curiousity killed the cat...
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Old 07-21-2008, 11:06 PM   #19 (permalink)
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Hi guys,

& it worked :-)
My first car fix ever!!!
Joan.
Congratulations and Welcome as well.
Enjoy your stay.

Cheers , Pete.
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Old 07-22-2008, 10:05 PM   #20 (permalink)
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May be no big deal, my "check engine" light has been on since about december so about 7 months. Could be a problem too though.

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