P0137 keeps coming on. -checked for exhaust leaks and found none. -replaced downstream o2 sensor. -cleaned all fuel injectors and sprays nicely. -lastly, i thought it was wiring issue, so i bought whole wiring harness from ebay and replaced the entire wiring harness. But p0137 still comes on after a day of driving. Can anyone help?
That's a low voltage in the oxygen sensor circuit Why in the world would you change a whole wiring harness for that seems kind of odd when you could just trace down the wiring that goes to the O2 sensor what's it four wires heating sensing etc usually it's the heater that messes up in the O2 sensor which I think causes similar to a wiring issue because the heater is resistive And when it fails voltage stops or something along those lines and it's seen as a wiring or voltage problem so maybe you need to revisit that a little bit did you replace the oxygen sensor by chance?
