Help. service engine light on..

[Mike H]

Engine light came on, turned off on 3 times, looks like the flash numbers are 321-42-56....anyone have a clue?..Thanks

 

[C O D Y]

Page 25-3 in your sevice manual. There are several listed for 42 (seems to be an open circuit) none listed for 56.

 

[Mike H]

Well, its fixed....was a bad rear oxygen sensor.