Did it by the book, no issues. Unplugged the primary o2 sensor and dropped the stock header. Removed o2 very carefully and put it aside. Installed J's header and screwed on the o2 again carefully and easily. Plugged in.

Bam, code P0135 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)


I double checked everything. It's torqued to spec. Tried blowing out the connector with some compressed air. Nothing.

Any suggestions before I start poking with the voltmeter?

 

the error code is a malfunctioning 02 circuit,

check the pins that lead to the plug to make sure they didnt slightly pop out of the harness. when i had my RSX (turbo), i had a 3" downpipe that had the o2 sensor on it. i once went to the muffler shop and bringing the car up on the lift i banged it causing 1 or 2 of the wires to come loose off the weather pack (plug), so i took the o2 off and pushed the pins back in. solved the issue.

if it was working before the install, i doubt it got damaged just removing it. did u disconnect the battery and reconnect to see if it clears the code?

tony

 

I looked at the 4 pins in the plug and they were all in perfect shape....

 

Has anyone installed a header with no CEL's on a MY06+?