Question on similar obd trouble codes

Perhaps he can get some of the bank bailout money to get it fixed?

"Jeff" wrote in message

On Dec 22, 3:57 pm, Moses wrote:
> My Taurus has been showing 171 and 174 for a while but now it has
> added 1131 and 1151. All of these indicate lean mixture on both
> banks. What is the difference?

One bank is towards the passenger compartment and one is towards the
front of the car.

Jeff
 >> Stay informed about: Question on similar obd trouble codes 

P0171 and P0174 indicate that the adaptive fuel strategy has reached a
preset limit... typically, this would be when long term fuel trims have
reached 25% fuel adjustment (rich or lean, though lean is more common than
rich).

P1131 and P1151 indicate that we have moved beyond the fuel systems ability
to cope with the condition and the O2 sensors are no longer switching
rich/lean and are, in fact "trapped" lean.

The P0171/4 are telling us that we are getting into trouble - let's do
something about it - many times with no driveability symptoms. P1131/51 are
telling us that we ARE in trouble and there is every chance that we are
experiencing driveability symptoms.... or soon will.

Compare this to a small child.... P0171 is "I have to go baffroom.". P1131
is "I have to go baffroom" along with foot stamping and breath holding....
If we wait too much longer than this.... it can get less pleasant.

HTH


"Moses" wrote in message

> My Taurus has been showing 171 and 174 for a while but now it has
> added 1131 and 1151. All of these indicate lean mixture on both
> banks. What is the difference?
 >> Stay informed about: Question on similar obd trouble codes 

Good explanation! Yes, I have started to experience driveability
problems including hesitation and missing at idle. But the cause
remains elusive. I'd like to see manifold vacuum a little higher but
don't detect any leaks, The PCM controls are believed to be ok.





On Dec 22, 9:27 pm, wrote:
> P0171 and P0174 indicate that the adaptive fuel strategy has reached a
> preset  limit... typically, this would be when long term fuel trims have
> reached 25% fuel adjustment (rich or lean, though lean is more common than
> rich).
>
> P1131 and P1151 indicate that we have moved beyond the fuel systems ability
> to cope with the condition and the O2 sensors are no longer switching
> rich/lean and are, in fact "trapped" lean.
>
> The P0171/4 are telling us that we are getting into trouble - let's do
> something about it - many times with no driveability symptoms. P1131/51 are
> telling us that we ARE in trouble and there is every chance that we are
> experiencing driveability symptoms.... or soon will.
>
> Compare this to a small child.... P0171 is "I have to go baffroom.". P1131
> is "I have to go baffroom" along with foot stamping and breath holding.....
> If we wait too much longer than this.... it can get less pleasant.
>
> HTH
>
> "Moses" wrote in message
>
>
>
>
>
> > My Taurus has been showing 171 and 174 for a while but now it has
> > added 1131 and 1151.  All of these indicate lean mixture on both
> > banks.  What is the difference?- Hide quoted text -
>
> - Show quoted text -
 >> Stay informed about: Question on similar obd trouble codes 

As I'd said, lean is more prevalent than rich when we see mixture stray from
stoichiometric.... simply because so many things can drive the system lean
while so few can drive it rich...

Some of the simpler things to try would be to inspect the MAF sensor for
contamination, replace the fuel filter (testing fuel pressure while driving
would be a big plus).... making sure that the ignition system is decent ..


"Moses" wrote in message

Good explanation! Yes, I have started to experience driveability
problems including hesitation and missing at idle. But the cause
remains elusive. I'd like to see manifold vacuum a little higher but
don't detect any leaks, The PCM controls are believed to be ok.





On Dec 22, 9:27 pm, wrote:
> P0171 and P0174 indicate that the adaptive fuel strategy has reached a
> preset limit... typically, this would be when long term fuel trims have
> reached 25% fuel adjustment (rich or lean, though lean is more common than
> rich).
>
> P1131 and P1151 indicate that we have moved beyond the fuel systems
> ability
> to cope with the condition and the O2 sensors are no longer switching
> rich/lean and are, in fact "trapped" lean.
>
> The P0171/4 are telling us that we are getting into trouble - let's do
> something about it - many times with no driveability symptoms. P1131/51
> are
> telling us that we ARE in trouble and there is every chance that we are
> experiencing driveability symptoms.... or soon will.
>
> Compare this to a small child.... P0171 is "I have to go baffroom.". P1131
> is "I have to go baffroom" along with foot stamping and breath holding....
> If we wait too much longer than this.... it can get less pleasant.
>
> HTH
>
> "Moses" wrote in message
>
>
>
>
>
> > My Taurus has been showing 171 and 174 for a while but now it has
> > added 1131 and 1151. All of these indicate lean mixture on both
> > banks. What is the difference?- Hide quoted text -
>
> - Show quoted text -
 >> Stay informed about: Question on similar obd trouble codes