2001 grand prix service engine light

2001 grand prix, recently had a tune up. today the service engine soon light came on. anyone know what could cause this or how to fix.
Vinnie

What model GP do you have to include engine size and mileage?

To find out which DTC error code(s) triggered the SES/CEL light you need to have it scanned with an odbii scanner. Places like AZ will do it for free.

model se, 106,000 miles,3.1 litre engine.
Thanks vinnie

I'm curious as to what was done on the tuneup and what the cost was?

I'm curious as to what was done on the tuneup and what the cost was?

i just purchased the car and the previous owner did the tune up, plugs, wires, air filter , stuff like that. don't know the cost.
Vinnie

bnaylor
i took your advice and went down to AZ and the code po420, catalyst effiency below threshold, bank 1 came up. any idea what that means?

Vinnie

Time for a new CAT?

bnaylor
i took your advice and went down to AZ and the code po420, catalyst effiency below threshold, bank 1 came up. any idea what that means?

Vinnie


I replied earlier at your other post:

http://www.automotiveforums.com/vbulletin/showthread.php?t=583299

So far the general consensus is the CAT.