I replaced my bank 2 O2 sensor back in October. Now I am getting the P0150, P0174 and P1174 engine coders again.

I have run Seafoam through the tank.

I have check for vacuum leeks and cruise the vacuum lines with a can of starting fluid. Nothing.

I plan on doing the induction cleaning this weekend but don't hold out much hope that will resolve this issue.

What are the chances a new Bosch O2 sensor would go bad in 3 months?

An chance its a connector issue?

I have read the O2 sensors are very susceptible to oil contamination of the harness. Is worth putting an extension between the sensor and the harness? Perhaps with a loop.

I have seen recommendations for the BG44 fuel injector procedure at a shop. Is this worth it? Any alternatives?

Anything else?

Thanks In Advance,
RS

 

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i had same problem...new 02 went bad in less than a week.
replaced it...atlantic british sent a replacement free of charge.

i did the seafoam through the intake, was not expecting much difference...
but WOW...WOW....best $10 i EVER spent.

i preferred to follow the directions on the can over the directions on this site.

i.e use 1/3 of a can (ok...i used 1/2 can) and let it sit for 5 minutes (instead of the 30 miutes suggested here)
i did that twice. Letting the engine cool down completely before doing it a second time.

pour the 1/2 can into a separate container, it sucks up quick!

night and day difference on mine...didn't even realize it was running so bad

 

Check your connection, no need to ask us to do it. If there is oil on it, your v/c gasket is leaking, fix that the clean the connect with contact cleaner, use a little die electric and reconnect, if you still have a problem, get the 02 replaced under warranty.
Also, you cruise control vacuum is not connected in any way to your engine.

 

Replaced the O2 under warranty........cleared the code and everything was good for about 2 months. Then I got P0150 back.

Swapped the front O2 sensors and the code did NOT follow (no codes returned at this point).

At this point I figured fuel injectors and/or valley pan gasket.

I took her to a local mechanic to have the engine smoked for vacuum leaks and to have the fuel injectors cleaned. They aren't a "BG" shop but had the equipment an a similar cleaner.

Thankfully the smoke test showed no vacuum leaks. I was not looking forward to a valley pan gasket change.

At this point I definitely recommend the fuel injector cleaning. My Disco would idle at just under 1000 RPM (eye balling the gage) and had the "Disco Rumble". She now idles at just under 750 and is smoooooooooooooth........Drove her for about 10 miles and no codes.....

I will update this tread again in a week or so to confirm this did the trick.

RS

 

The saga continues. The next day the check engine light came back on, codes P0130, P0171 and P1171, and the engine began idling rough. So it does appear the problem did follow the oxygen sensor after all.

The issue now is why did the O2 sensor go bad……….again. This is sensor number 3 in the upstream bank 2 position over the last six months. I believe I either had a dirty fuel injector in bank 2 that eventually coked up the sensor or oil is leaching its way into the sensor through the lead wire and causing it to fail. (Last week a local shop ran fuel injector cleaner through the rails and injectors)

I swapped the bank 1 upstream O2 sensor back to original position. I purchased a Bosch Universal O2 sensor, p/n 15738, for bank 2. I did this because it comes with about 2 feet of lead length and its own connector to mate with the harness cut from the old sensor. I wanted the extra lead length to change the routing of the harness to get it away from potential oil leaks. The extra connector inline should also help mitigate oil from being a contributor.

Cleared the codes and she is back to running very smooth at idle. I will again follow up after a period of time to update this thread as to how successful this course of action is……….


RS

 

Im looking into this too... its pissin me off... lol