So I replaced the engine with a JDM and cleaned all of the carboned-up parts including intake manifold, fuel injectors, throttle body, MAF, sensor on the intake manifold, all tubing, EGR cooler. I replaced the original Air/Fuel sensor from the JDM, with the original engine's upstream O2 sensor. Then after driving for a bit, I got P219A so I replaced the upstream sensor, MAF sensor, sensor on the intake manifold. Then I got similar codes. Then I replaced both O2 sensors with Bosch. Now I'm getting a pending P2237. The rest of the codes say permanent but are no longer pending. I was thinking maybe the wiring harness is bad to the Air/Fuel (upstream O2) sensor but am not convinced. After pulling it off, it looks sound with no compromise of the wires or burn evidence. Should I just bite the bullet and get Denso sensors? I am lost at this point
Continuity checks on all three wires. I checked between the O2 sensor plug and the pin receiver on the large ECM harness. There is a 4th black wire not mentioned. I assume that my Bosch 18071 wire is fine since it is brand new. Next step, purchase Denso 234-9112 I guess. Hard to believe a brand new Bosch sensor doesn't work.
