I installed a CAI and a catback exhaust on my Ep3 No code after Cai install, now after having the Cat back put on, Its throwin P1166 and P1167... Any help telling me possibley hw to fix the situation would be great, because I already know that it is something with the air/fuel mixture. And I already reset my Ecu so where do I go know?

 

The O2 sensors are fragile, especially if you drop them. Could you have done that?

 

P1166 / 1167: Heated oxygen sensor (H02S) circuit malfunction (Bank 1, Sensor 1)
Bank 1, Sensor 1 is the O2 before the catalytic, closer to the manifold.

I would check and make sure that the electrical connectors are at least plugged in. If they are, check for an open in that circuit. I'm guessing that because both these codes came up, While doing the cat-back system the sensors were accidentally left in and the wiring harness snapped. Just a guess, but check for power and ground to the heater and sensor.

 

i have the same problem on my car after i put my cat back on. nothing was moved or hit or yanked or anything, as soon as i thuned my car on the cel came on. i went to get it flashed and the same codes came on. i thought about buying new sensors but their bank at least for now. i also checked all the wires leading up tp the sensors and everything look fine so i don't know.

 

That's wierd, hope mine don't do that when I put my exhaust on.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by paqman &raquo;</TD></TR><TR><TD CLASS="quote">P1166 / 1167: Heated oxygen sensor (H02S) circuit malfunction (Bank 1, Sensor 1)
Bank 1, Sensor 1 is the O2 before the catalytic, closer to the manifold.

Just a guess, but check for power and ground to the heater and sensor. </TD></TR></TABLE>

By check the heater, what are you talking about? And we are talking about the o2 sensor in the header correct? What does circuit malfunction mean, specifically? I thank you for your post!

 

Help

 

mostly likely is your o2 sensor is messed up or didnt put it right