I'm getting codes 172 and 136 with the key on engine running tests. The fault code book says the 172 is a HEGO HO2S sensor fault (lean) and the 136 is the same but (always lean). I suspect I have an injector problem but I can't tell which injector is bad. I don't have anything to listen to them with.
Don't know for sure if it's an injector. Just guessing. Anyone have any ideas?