Hi guys! Long time reader, infrequent poster here...

I've got a 2.8 engine that eats sensors for lunch, any advice? My story goes like this:

Lately I've got rough idling (intermittently dropping to 700rpm in gear) and the engine light came on, OBD scanner spits out following codes:

0154 - Bank 2 Sensor 1 O2 sensor no activity detected

1130 - Long term fuel trim bank 2 system too lean

1411 - Air injection system bank 2 flow too low

The thing is, I've got 0154 and 1130 codes before, and I've replaced O2 sensors TWICE in May 08, Jan 10 with different mechanics already. Now the bloody code is coming back to haunt me again.


I have spent wayyy too much money to keep my bone-stock 2000 A6 2.8 running (around 98K miles) . Since it makes no fiscal sense to throw more $ at it (car worth $5K at most), if its just burning gas inefficient, I don't mind running it as-is rather than throwing another few hundred at it.

Mind throwing some advice on what the problem is and how to (if in fact I should) fix it?

Any help is much appreciated!

-Kev

 

Whenever you have codes, it is a good idea to scan the car in real time to monitor the sensors and see what's really going on. You may have a vacuum leak or sticking injector on the lean bank, even the sensor problem, there are a lot of variables. The cost to scan the car is low compared to guessing at fixes. If the sensor is pretty new and this has happened before, I would be suspicious of a wiring harness preoblem on the O2 sensor. Solve the sensor before worrying with the air injection... that just reduces NO2 and is not very critical other than the annoyance of the light.