P0139 Honda -

Question

I have a 2005 accord with 95,000 miles that presents code P0139. I have replaced the rear O2 sensor with a new Honda sensor twice thinking that the first one was defective. The code now comes and goes about every 300 miles or so. I have detected no bad wiring. I took it to a shop that did diagnosis on it and they told me to take to Honda and have the ECM reflashed. Does this sound plausible?

Answer 1

P0139 Heated 02 sensor slow response

Yes this is true. Honda has produced a TSB about this condition TSB# 14-001 titled MIL on with DTC P0139 stored in memory , what this is about is the PCM misinterpeting the secondary 02 sensor which require a update for the PGM-FI software. You also have 2 major Recalls that should also be take care of, Recall # 11-050  ECM / TCM update to prevent A/T damage. and Recall # NHTSA11V395000 A /T control moduel software update. This recall is for automatic transmission.