Is that all you post now?

 

What does that mean?

 

I`ve got other projects going on (not truck related) and just subscribing to the post so I can notice by e-mail and read them later. I`ve been working on a Audi and the neighbors RV for other people. Smiley guy eating pop corn and watching. I may out of the loop for now but still like to learn by others.

 

I really wish people would Google their codes when asking for help. It only takes about 5 minuets and I could have had an answer at lunch. OK so p0136 is low voltage on O2 sensor bank 1 sensor 2. That's your cat monitor sensor. Its stuck reading lean or low voltage so either the system is stuck lean or the sensor is broken. So we go to the next clue. P0141 O2 sensor bank 1sensor 2 heating circuit malfunction. This is the same sensor and its not warming up properly. So now we know that sensor or its wiring is likely bad. P0174 bank 2 sensor 1 system lean. This says the upstream sensor on the drivers side is lean. So we could have a bad sensor there or a lean condition.

 

OK I just reviewed the original problem basically lack of power. Lean conditions will cause a lack of power. We don't see lean on the other bank so its likely the problem is only on the drivers side head. The best next step if I were working would be to look for more symptoms. Pinging or misfire would indicate the cylinder to look for the problems. You can test the downstream sensor with a multimeter because the voltage should stay stable. But with 2 codes j would just test the wiring and connector and replace the old sensor. The upstream is constantly switching so you need a scan tool to read it properly. You can back probe with a meter and see that its changing constantly but its kind of difficult with little pay off. Look for a vacuum leak on that side, a misfiring cylinder, a bad fuel injector, a fuel leak on that bank, stuck valves, no spark, exhaust leak, anything that would cause a lean condition on that side. Remember that the sensor only reads air not fuel so if you get no burn even if the fuel goes through the sensor will read the extra unburned oxygen and call it lean. A vacuum test may help cut down some possible problems and checking spark plugs may identify a bad cylinder.

 

Hey thanks buddy!!