Hi! I got this annoying 31 code "emissions control" crap. I can't seem to get rid of this annoyance. Does anyone know of a product that I can spray all around my engine to see if I have a leak in any hose or a tiny crack anywhere. I did the following 2 weeks ago:
>
replaced fuel filter
cleaned body throttle
replaced auto air control sensor
replaced pcv valve
o2 sensors
...and a couple other minor stuff

ANY suggestions is welcomed.

 

u pretty much wasted every bit of that money for nothing u dont even under stand what the codes was and start throwing parts at it like mad.
beside code p0031 is bank 1 sensor 1 heater O2 control circuit. Try an O2 sensor upstream.