Taurus service codes

[TomK5618]

Does anyone know what "P071 and P072 System To Lean Bank 1 & 2" means?

Thanks for your help

[way2old]

It means the engine has unmetered air going into the engine. Look for a vacuum leak. Are you sure of the P071 and P072 numbers? If both banks are lean it should read P0171 and P0174. P0175 is for rich running.

[Lynde]

Originally Posted by TomK5618

Does anyone know what "P071 and P072 System To Lean Bank 1 & 2" means?

Thanks for your help

it's probably the EGR ports are clogged or the EGR runner seals on the intake are bad, sucking in air. Just a guess, had a lot of troubles with that.