Wiring diagram for the o2 senser

Easy thing first- check for a fuse for the O2 sensor heater circuit. If that is fine, probably just need to replace the O2 sensor. Code is for a bad O2 heater circuit. Sensor 2 would be after the catalytic converter.

if the computer is the correct part number its either the o2 senser or the heater wire is broken where it comes out of the computer test the wire first by checking the risestance from the computer to the o2 senser

P1491 Rad Fan Control Relay Circuit An open or shorted condition detected in the radiator fan control relay control circuit. This includes PWM solid state relays.P1495 Leak Detection Pump Solenoid Circuit An open or shorted condition detected in the Leak Detection Pump (LDP) solenoid circuit.P0753 (M) Trans 3-4 Shift Sol/Trans Relay Circuits An open or shorted condition detected in the overdrive solenoid control circuit or Trans Relay Circuit in JTEC RE transmissions. Was MIL code 45. P0753 (M) Trans 3-4 Shift Sol/Trans Relay Circuits An open or shorted condition detected in the transmission 2-4 shift solenoid circuit (4-speed auto. trans. only).P0136 (M) 1/2 O2 Sensor Heater Circuit Malfunction Oxygen sensor heater element malfunction.

Aside from getting into an accident and having your wiring harness severely damaged, the other likely suspect is your PCM. These codes are not related to each other and indicate a much larger problem.

Usually you have to splice the wires into the old plug.
You might be able to find a diagram on the websites for auto parts stores such as autozone.

P0031 Oxagen senser heater circuit. The heater circuit can be checked with a test light connected to ground. ( a tast light is an ice pick looking tool with a clear handle with a 12 volt bulb inside and a ware with a clip to connect to grond, the light will light as the tip is touched to anything powered up with 12 volts and sometimes a little more and a wholde lot less) Find the oxagen sensers ( thier screwed into the exhaust pipes) Disconnect the electrial connectors and connect the test light to ground, with the key on test the wires in the plug connect ed the vehical. one of them should light the light, if it does reconect it and test the rest of the sensers, recalling which wire was live. ( most are white or grey but they vary some. If all the sensers have power it's not the power but the senser failed. with an ohm meter test the senser for the wire that was hot to the other wire that is the same color if the sneser is open ( no circuit ) you have found the bad senser. If you can't find power going to any of the sensers. Check the fuse boxes for blown fuses ( check them all with a test light) If you find a blown fuse replace it but go back to the wiring tjat connects to the sensers and you'll find someplace where the wire melted to the exhaust pipes and shorted out, blowing the fuse. The sensers short out too but not very often.

6 cylinder or higher have 4 o2 censor, and check pcv valve to see if its clogged

Could be module check with the dealer where is.

buy a hains manual from an auto parts store

Check tgis documents: ZJ-Secc-8W-Wiring-Diagrams ( INDEX Page 8W-35 )

Good luck and dont forget rated me.

check o2 sensers and ground wire to them make sure its no corroded if you have v8 engine the groud is under ac unit.