About a year ago I bought a 1997 Ford Probe and as of right now it has approx. 116,000 miles on it. It is the 4 cyl. 2.0 liter automatic transmission. The check engine light has been on practically since I bought it and I recently read the codes as to why it was on and it told me it was PO421 Warm up catalyst efficiency below threshold (bank 1). Well I read more into that and found out it was the oxygen sensor, but was wondering if there is more than one oxygen sensor on the car and if so where the bank 1 one is so I can change it. The car also jerks a lot when shifting into drive and reverse and I was wondering if this has anything to do with the sensor. Thanx for your help.
have the same problem?
Wednesday, August 22nd, 2007 AT 10:32 PM