Hi I have a 2002 3.0 SE which keeps throwing up fault codes P0171 and P0174 I’ve cleaned the MAF sensor, changed the air filter and looked for vacuum leaks but so far I’ve been unable to sort out the problem, I’ve noticed that once I’ve cleared the codes they only come back when I take the car out for a drive after about 5 minutes, has anyone any ideas what may be causing the problem, many thanks

25 minutes ago, Paul71 said:

Hi I have a 2002 3.0 SE which keeps throwing up fault codes P0171 and P0174 I’ve cleaned the MAF sensor, changed the air filter and looked for vacuum leaks but so far I’ve been unable to sort out the problem, I’ve noticed that once I’ve cleared the codes they only come back when I take the car out for a drive after about 5 minutes, has anyone any ideas what may be causing the problem, many thanks

Paul 

These codes relate to Left Bank and Right Bank fuel mixtures. Could well be Lambda Sensors, certainly worth a check on them.

Best of Luck, John 

HI

P0171 AND P0174 are usually lean codes, air leaks between engine and maf, so a split pipe or perished hose

check all those little hoses, lots of garages have smoke machines that fills the inlet system and you can then visably see where it leaks from

cheers

Joe

 

Thanks for your help

Hi i had same problem. check the crank case breather hoes as well i was lucky it was the top one  which cost £8.49 from jag.

Thank you