I've been through the whole ball of wax-----smoke test, re-checking the vac- hoses over and over--changing this and that to include the fuel filter, but nothing would stop the car from throwing the 0171 & 0174- too lean banks 1 & 2. I even cleaned the MAF, but nothing helped.

Trying to keep away from the very expensive MAF sensor, because nothing pointed to it. So opening the old wallet a little wider, I purchased one, installed it and no codes since.

Just a little tidbit to keep in mine.....

Cheers.

 

Check the exhaust between the engine an cats

The the flanges between the manifold and exhaust can work loose
You can get to them under the car, no need to remove the under tray

Cheers
34by151

 

I've seen many occasions where the MAF can be the culprit, and it doesn't log a trouble code. One obvious symptom of a MAF issue is when you try to rev up the engine from idle, and it seems like it struggles to rev up. Usually you can get away with cleaning the MAF, sometimes you can't. I have also seen where the DTC's P0171 and P0174 log, yet the car seems to run ok. If you're able to look at fuel trims, this can be a dead give away. The MAF affects so many things on these cars, but more with the V8's.

 

New MAF and PCV fixed mine
2006 Portfolio

 

Maybe I didn't make myself clear in my post above. What I meant to say was: after I bought a new MAF sensor and installed it, The 0171 and 0174 codes were eliminated--gone. So the old MAF Sensor was the problem all the time.


Cheers

 

Excellent

 

Glad to hear its fixed. You'd think that would get a code for it being a sensor, and one of the most important ones, as with most other sensors will log a code when faulty. I've replaced a lot of MAF sensors, and not one has logged a code. I have either recognised it by listening to the way it revs from idle, or by watching fuel trim data. They can be tricky sometimes, but the MAF issues always seem to be with the V8 N/A.

 

Chuck, after replacing the MAF did you clear the codes and they didn't come back? Or are you saying they went away on their own right after replacing?

 

ayavner-------------to the best of my memory, I cleared the codes before the installation.

before or after shouldn't make a difference, if my clearing them helped at all.

Chuck

 

Do you mind sharing where you sourced your MAF sensor and brand?
Thanks!

 

When I bought my 06 SV8 it had codes P0171 and P0174 - (lean condition on banks 1 and 2) and I drove it 600 miles home that way. At home I discovered that someone had failed to reconnect the hose from the PCV valve to the bib on the side of the intake tube. I reconnected it and have not had the codes since.