So I've had a couple CE codes that just keep coming back:

172 - HEGO sensor circuit indicates system lean (right side)
176 - HEGO sensor circuit indicates system lean (left side)

What is HEGO and why am I getting these codes??

-Chris

 

heated oxygen sensor

 

Hmm... Well I just replaced my oxygen sensors about 8k miles ago.

-Chris

 

Forgot to mention, this is a KOEO code.

-Chris

 

sensor, sensors or wiring.

look for loose or burnt wire.

try clearing the computer.

 

I can't see how it could be lean if the engine is off.

 

Yeah it's a continuous memory code (happens during operation and gets stored in memory) that gets pulled during the KOEO test. I'm using a code reader that gives out a digital reading of the codes that are thrown.

-Chris

 

Double check the o2 sensors wires and connectors, and also checked sensors for being tight. All good there. Any other ideas?

-Chris

 

did you run seafoam through the engine.

new parts do not mean good parts.

try to get the store to give you 2 new sensors.

or bite the bullet and replace them.

what brand are they?

 

They're brand new, I said 8k but more realistically they're probably less than 5k old. I just can't imagine that they could be bad! They're Bosch sensors. I know that whole saying about how new parts aren't always good parts but these suckers are $50 a pop! I can't be throwin' around money like that. I'll see if I kept the receipt and maybe autozone will replace them.

Are the o2 sensors really the only things that'll throw the hego code? How 'bout a clogged cat?

-Chris

 

i can't believe you go to autozone.

if you had a clogged cat you would know it, a very extreme lose of power.

 

Sorry, scratch that. I bought them at Kragen. Anytime I shop at autozone it's only for cheap tools (eg. fuel line disconnects) or brand name parts. But even then - very seldom.

-Chris

 

did you run seafoam or any additive in the fuel?

 

Hmmm. The last time I ran injector cleaner/fuel additive it was Chevron Techron cleaner and that was ~5k miles ago. Why do you ask?

-Chris

 

check your fuel pressure, intake, and vaccum leaks!