P0135
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

P0136
O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)


Any help will be greatly appreciated!

 

nevermind...apparently bank 1 is before the CAT and bank 2 is after the CAT...

 

Your car only has 1 bank. By those codes looks like both sensors are at fault.
The only cars that have 2 banks are the 6 cylinder motors.

 

THanks again tech!

I was just wondering,

could it be a vacum leak and which hose or hoses should i check first? and what's the best way to check them?

 

Yes it is possible it could be a vacuum leak.Best way to check is with it running spray around all hoses with Carb cleaner and listen for the idle to change.

 

Ok I'll try that as well. Someone on another forum was saying to check the wires with an ohmmeter and that if it read highthat most likely the heater was burnt out and would need to be replaced. Im not a mechanic so i don't really know what "high" would be as far as reading the ohmmeter. Also what would you check first? the vacum or the resistance on the wires?

here's what they said...

"Check the wiring to the sensors, the heater malfunction on bank 1 indicates that the circuit to the heater wires is open or shorted. You can use an ohmmeter on the two white wires from the sensor and it should read low resistance. If the resistance is very high then the heater itself burned out and the only way to fix it is to replace the sensor. There really isn't enough information on that code to narrow it down.

There was a TSB on some years that added an extra length of wire to both sensors which doubles the number of connections that can go bad."

Does the car need to be running when i check the resistance on those wires?
I hate to be a pain.. everyone seems so helpful and i appreciate greatly

 

Check the vacuum leaks first.
But usually when the heater circuit comes up I know the sensor is bad. I have never even tested a sensor like that I have just replaced them.

If you want you can test it. Car off and the sensor unplugged.

Also the comment about the extra plug I highly reccomend making sure it is inline if the car falls under it.

 

what do u mean inline?

 

There was a harness designed to go in between the engine harness and the O2 sensor. It was designed to stop the O2 from being contaminated. See the wires are basically hollow on the center air flows through the wires in the sensor and in the harness. After time oil would work its way in there and contaminate the sensor. The harness was designed to stop that from happening.

 

this is an old post, and old car..
Just want to add that a smoke test might provide some clarity for vacuum leaks.. since it hasn't been mentioned.
Also I'm wondering if you had found the solution?