I have a 2005 dodge Durango with a 4.7 litre .I had just bought it and noticed a bank one exh manifold leak.a check engine light on and lots of rust from under the chassis thinking this dodge at one time hauled a boat .so I put together a scenario that this truck had blown 2 back studs on the manifold from saltwater and most likely the code p0036 was from the exhaust leak.so I repaired the manifold leak and tried to erase the code with the obd2 scanner, no such luck. I had even disconnected the battery and the check engine light stays on ,never goes out for even a second,can this be a 02 relay and if so where is this relay .please help thanks 99435 miles.

 

Might be a bad sensor......

Welcome to DF!

 

yes but I still should be able to reset check engine light and it will trigger later ,even removing battery terminal doesn't reset it hoping its not the ecu.

 

Depends on the failure. If the failure is present as soon as you turn on the key, it will reset the code.

 

Ok thanks ,will install bank 1 downstream sensor .will see results.

 

ok,so I installed bank 1 sensor 2 o2 sensor ,was able to clear code p0036,about 3 miles later I got code p0141 cleared the code reset battery to set ecu still throwing new code p0141,bank 1 sensor 2..????. I went to autozone and a employee there told me cleaning out the tbi & iac could help I'm baffled.checked pigtail didn't see any signs of damage.p0141 heater performance.

 

If you're seeing a lot of rust on the chassis, then you need to be looking for corroded (high resistance) grounds for the O2 sensors. The heaters, signals and returns are all separate circuits.


Auto Zone is ridiculous. If they really knew, they would be fixing them instead of selling parts. They offer free scanning to sell parts...and that's all.


Also, don't buy the cheap sensors that AZ has. Many times the heater circuits will be DOA out of the box. Get NTK O2 sensors.

 

you hit it on the nose ,thanks I bought a new bosch 02 sensor the one I bought on ebay was bad as you said heat sensor was crap. check engine light is out ,anyone out there have the tool to remove the rockers trying to replace 3 bad lifters, god I love this forum ,good people here.,

 

I'm sure you could find one on Ebay or Amazon.








Special Tool 8516 Rocker Arm Remover

Special Tool 8387 Valve Spring Compressor