code p0420
wdy
06-21-2005, 09:10 PM
I have a code P0420 coming up on my 97 s-10/4.3 liter. I know it is a 02 sensor but I'm not sure which one it is. the reader I used read Catylyst Effeciency Below Threshold (Bank 1). Is this the sensor before the catylyst? Thanks, woody
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