Check engine light just came on with my 2001 V70 T5 137K miles. Took to auto zone and code P0172 came up, system too rich bank 1. Searched this forum and it seems like it could a multitude of things (leaking fuel pressure regulator, canister purge solenoid, faulty heated oxy sensor bank 1). Car is runing ok, occasional rough idle at start up (mechanic cleaned throttle body couple months ago and did not eliminate idle issue) and sometimes surges at slow speed but nothing major. Before I replace every sensor chasing this problem it seems like many others who get this code ultimatley end up replacing the MAF sensor to reslove the problem??

Any thoughts would be greatly appreciated. Thanks!!!

 

Did you get an answer on this?