I replaced my oxygen sensor twice and I STILL get a P0051 & P1078 codes for my bank 2 sensor 1 02 censor. Can anyone suggest a possible solution. It's obviously NOT the 02 censor causing these codes as I have replaced with 2 new OEM sensors and get the same codes.

Want to be accurate in matching wires. I was assuming this diagram referred to the (harness side) of the connector and not the connector side. but Im still getting trouble codes in my o2 censor.

 

Well, the codes you have are not really related as the P0051 is for the heater circuit of the AF Sensor and the p1078 is for the exhaust valve timing solenoid so let's start with the AF sensor. Your picture is correct so let's get a voltmeter and test for voltage between ping 4 and 3 with the connector unplugged. You should have battery voltage (12v nominal) Next check between pin 4 and chassis ground. The same 12v should exist. Next turn the car off and check for continuity between pin 3 and ground. This should be 0 ohms. Next let's test the Sensor side of the connector...you should be reading between 1.8 and 2.44 ohms. Also check from pins 1 to 3, 2 to 3, 1 to 4 and 2 to 4. This should be open.
Post your results and I am sure someone here can help isolate or determine next steps.

 

Thanks for your feedback. I have voltage, but was clueless of how to check continuity. Will be giving it a shot in the morning.

 

I got full voltage when testing pin 4 with the battery ground, but no voltage when testing pin 3 to 4. Also no ohms when testing pins on the sensor. Brrand new censor however.

 

Based on those results, the old adage holds true, "new does not mean good!" An open between 3 and 4 means that heater circuit is shot, or that sensor is not the correct one. Also interesting you have no voltage reading between pins 3 and 4 on the connector but you do pin 4 to ground. That is also telling me you have a bad wire or ground somewhere (i assume you tested with engine on?)

 

I took this to a mechanic and he had my censor wires connected in reverse of the diagram I sent you (which I was told referred to the "harness side" of the connector, so it is currently wired up form the side where the wires extrude form the back, not the connector side, but I fear that I may have blown something as a result of the incorrect slicing of wires (as my connectors had to be replaced and they had to cut and re-wire). here's the rusts I have now



(with ignition on)

pin 4 to battery ground. 12.5 volts

pin 3 to pin 4 = .060 volts

(continuity on censor connector side)
1 - 3 = 0L
2 - 3 = 4 ohms
4 - 1 = 0L
2 - 4 = 0L

 

Yeah it appears that the wiring and or sensor is jacked. I havent looked at the fsm or Alldata to validate the pinout you provided either so it is possible we are all looking at bad data to begin with. I hope to have some time this weekend and will see if my two brain cells are functional enough to research this.

 

I checked wiring and all of the wires are in place. 02 sensor fuse is good too but I'm still getting that P0051 code. I ordered a new computer as I was told I could have fried the circuit in the ECU.

Now everything is getting alot worse. I have MULTIPLE manufacturer control and cam shaft censor issues and cannot tell why these code keep popping up. I just replaced the VVT Solenoid with a OEM replacement and I'm getting more codes than before. I there some sort of "reset" procedure I can do with the Maxima?

 

I also tested the ohms on a brand new censor not even connected yet and got those same results