2000 Discovery II with 82,000 miles
I have two codes PO 171 and PO174. where do i look, MAF or plugs and wires??

 

P0171 - Oxygen Sensor System Too Lean Fault Bank A
P0174 - Oxygen Sensor System Too Lean Fault Bank B

Not really sure where to tell you to start to look to troubleshoot the problems. Thought I would post what those codes mean so someone else can chime in with ideas to fix the problem.

 

Seafoam It

 

Probably the MAF sensor, make sure you get a Bosch one, not aftermarket. How often does it come back after you erase it? If not too often, I would hold off until I got a 3rd or 4th gear ratio code too. Also look for vacuum leaks after the MAF sensor.

 

Thank you

 

Seafoam, is this gas treatment & who carrry this product?

 

Search for seafoam on this forum, there are several pages worth of how-to's and general information on it.

The MAF is the most likely culprit. www.roverlandparts.com sells used ones.

Cheers,

Pete

 

PM me with your tele number and we can talk more about how to check and what to replace.

 

And for the rest of us who want to know what to do next?

 

When both codes show up together, if the MAF hasn't failed, then I would look for air leaks from the filter box to the t/body.