ESS Tune with the European Headers and relocated Sensors....

[Z4-VILLA]

Im still getting code 2C9C (Pre Cat O2 sensor heater input signal bank one)

Any advice here.....I feel the tune and its diffference on the "butt dyno" but I have no idea how I can get rid of this light. Before I go call Roman I was wondering if anyone has any sound advice.

Thanks you.

[Z4-VILLA]

BTW, Im liking the Ess Tune.

[pal]

I have been running the European headers with relocated O2s and EGT for a little over 2 years now. I have a stock DME/ECU (no chip) and have not seen any codes so far. You can read about my setup below and page 2 has information and pics on how the recall was done.

http://www.bimmerfest.com/forums/sho...d.php?t=419474

[ghosthi32]

user error

[johanness]

On my build I had two faults:

1) 2C7E - Oxygen sensor after Cat trim control
2) 2C93 - Exhaust gas temp sensor plausibility

After a metric TON of frustration (moving bungs, shortening bungs etc etc), they were both because of a faulty gasket. Easily fixed, and no codes since.

Never had a 2C9C though, sorry. Build link here: http://www.zpost.com/forums/showthre...t=euro+headers

[Jumbosock]

Bad O2 sensor??

[Z4-VILLA]

I would hate to have to change gaskets and sensors again but it seems like the only remedy at this point.

[ZStig]

I thought pre-cats aren't affected, its the post cats ones that are turned down in sensitivity. Sounds like a bad front sensor, or installed in the wrong bank or position. Check that first

[Z4-VILLA]

great I wish there was a way to know for sure....here comes the elbow grease

[ZStig]

look up the part numbers on each sensor

[Z4-VILLA]

Originally Posted by Roffle Waffle

look up the part numbers on each sensor

and then what?

[ZStig]

Look up the part number on pelicanparts.com and they'll tell you if the sensor you're looking at is a pre cat, post cat, bank one (closer to engine header), or bank 2 (closer to firewall header). Someone correct me if I'm wrong, its how I remember things