Engine code P-0171 coming up, possible O2 sensor?

Tiny
Z02MSK
  • MEMBER
  • 2002 DODGE DAKOTA
  • 23,000 MILES
I had my catalytic converter stolen, replaced converter but my gas mileage is still very bad, half what it was before theft, code 0171 coming up, when I drove it without the converter (about 2 weeks) could that have screwed up the O2 sensors or MAP sensor? Truck is 4.7 litre V-8 Quad Cab Dakota 2002. There is an O2 sensor upstream and downstream of the converter. Thank You Sincerely, Mike
Do you
have the same problem?
Yes
No
Tuesday, December 27th, 2011 AT 6:00 PM

3 Replies

Tiny
HMAC300
  • EXPERT
That is a lean fuel system and a stolen computer wouldnt'really affect it at least for that code. Check your fuel pressureit should be 44.2-54.2 psi. If it is below that then suspect a pump. Also check for a vacuum leak at intake. Spray some choke cleaner around intake and throttle body. But check the fuel pressure first.
Was this
answer
helpful?
Yes
No
Tuesday, December 27th, 2011 AT 6:18 PM
Tiny
Z02MSK
  • MEMBER
I stated my catalytic converter had been stolen, not my computer, I don't believe this answer is correct, I do believe that if there is a problem with the upstrem O2 sensor I could get this code (P-0171) Thanks
Was this
answer
helpful?
Yes
No
Wednesday, December 28th, 2011 AT 9:07 PM
Tiny
HMAC300
  • EXPERT
I meantconverter not computer, error on my part. P0171 is a lean condition which your O2 sensor will pick up when you don't have enough fuel pressre and your injectors make the engine run lean due to fuel starvation or not enough fuel. Or a vacuum leak will cause this as well or a large hose off of the engine as the computer will enrichen the fuel load as much as it can. The diagnosis is fairly correct with the information that is given. Check your fuel pressure this may be a problem with the pump or a clogged fuel filter. Either of any the things i've given you can cause this, not an O2 sensor. If you absolutely feel it's the O2 sensor then replace it and you'll end up with teh same code. What is your fuel pressure. It can also be an injector problem as well.
Was this
answer
helpful?
Yes
No
Wednesday, December 28th, 2011 AT 9:37 PM

Please login or register to post a reply.

Recommended Guides