I pulled some codes ( Ignition on engine off ) with my new scan tool, and I got a few questions. I got codes 10 11 33 & 91. 11 is crossing to a system ok code, and 33 is a EGR not opening properly code. Code 91 is showing up as a HEGO ( H02S ) sensor voltage low/ always lean, what does this mean? My Oxyogen sensors are bad? And what about code 10? It isnt even listed in my book as being a code. Thanks in advance!

 

i think code 10 is cant control rpm during self test or something like that

 

so does that have something to do with the tps being out of wack?

 

Isure hope someone can answer that 91 code. I got the same thing. I have talked to a lot of people and no one knows what it means.

What scan tool did you get? What did it cost?

 

I got this one http://www.sjdiscounttools.com/epi3145.html it was $38 shipped, came with a code manual and all.

 

Holy crap that seems cheap... I wonder if that is a decent tool. I may need to ****** one up myself.

 

I just ordered one... Good Deal

 

Code 10 is a "separator code" between On Demand (OD) codes and Continuous Memory (CM) codes......the output should have been.... 11-11-10-33-91-33-91.

11 = System Pass(OD)
33 = EGR valve not opening(CM)
91 = No O2 Sensor Switching Detected. always lean -driver side(CM)

11 = No problems on the real-time check of the circuits when the test was run.
33 = You have an EGR delete courtesy of the EEC-IV since the valve is not opening when the ECM "tells it to".
91 = You could have a faulty driver side O2 sensor, exhaust leak, or a fuel control problem causing that bank to stay lean most of the time.....suggest to switch the O2 sensors from sides, clear codes, test drive the car for 5-10 min., and run a KOER self-test......if code 41 shows up instead of 91....the O2 sensor is fubar.

 

Yup that was the exact way the codes came out of my scanner, I was wondering why they where all repeating except code 10. So if it turns out its not the o2 ( for code 91 or 41 ) could the egr possible be causing a lean condition or would that be on both banks and not just the driver side? Could a faulty injector cause the same lean condition?

 

If you exchange O2's from sides, and code 41 appears instead of 91.....that O2 sensor is kaput, needs to be replaced....if code 91 shows after exchanging O2's from sides.......one step at a time......lets see what happens when you switch them.

The EGR is "on vacation"...nothing to worry about, it will not affect A/F control or timing. A faulty injector will be in the company of a miss problem with a lean code most of the times.