My check eng. light will momentarily flicker on about once a week. It's always code 17, the feedback system. What is this all about?

 

Oxygen sensor circuit. Check for broken/grounded wiring in harness. The ecu isn't receiving signal. Mine broke under the shielded cable.

 

I bet it is the wire going to the o2 sensor. It gets brittle as hell over time.

 

What is the difference between a codes 15 and 17?!?!
15: O2 sensor
17: Feedback system for O2

 

the specifica are in the book, but basically 17 feedback is the ecu looking for a varying 02 voltage, under cruising/closed loop, when it doesnt see that you get code 17. it usually means the 02 is dead/unresponsive. 15 i think is if the 02 voltage is way wrong, but dont quote me on that its doesnt come up a lot

mike

 

My O2 sensor wire was broken somehwere deep in the harness. I just drilled a small hole in the firewall and ran a new wire from the O2 sensor to the ecu.

James

 

So perhaps it's the O2 sensor, perhaprs the wire...anyone have any other input?