-
Guest, 🎅🎄Looking for a stocking filler idea? Why not treat yourself or a loved one to our high quality CUPRA or SEAT valve caps. Order now from the merchandise store
Error code p0171
- Thread starter JamesLennox
- Start date
Check for spilt hoses around the inlet, could be a vacuum hose letting air in and messing with your mixtures.
Lean is usually always extra air being sucked in through a split pipe, usually a pcv hose. If the pcv system is tight then it could be a faulty MAF or something stopping the right amount of fuel being injected. If you've got vagcom or torque for Android then have a look at your long term fuel trims and see how lean it's running.
What's a pcv hose and where is that l?
Also I think I maybe getting that code because I have a induction kit and a decat which doesn't have the lambda sensors plugged in so I presumed it would be that
Also I think I maybe getting that code because I have a induction kit and a decat which doesn't have the lambda sensors plugged in so I presumed it would be that
i also had this,
was a split hose under the inlet manifold (caution when looking under there, oil dip stick will break)
swapped pipe and light hasn't come on since, i have also found that the car seemed to jolt when changing gear, was very hard to drive smooth under boost, changing this pipe seems to have sorted that.
was a split hose under the inlet manifold (caution when looking under there, oil dip stick will break)
swapped pipe and light hasn't come on since, i have also found that the car seemed to jolt when changing gear, was very hard to drive smooth under boost, changing this pipe seems to have sorted that.
Like sloth says above, PCV system runs under the inlet manifold and thats the number one place for a pipe to split and cause a lean code and general rough running,
Having the lambda sensors unplugged will also cause a lean code and that's what your code will be from! The front one is before the cat and should be plugged in. Without it the car won't be able to run properly and your fuel mixture will be miles away from where it should be!
If you're running a decat, then just fit a spacer on the rear sensor to stop it throwing a code for the cat not working properly.
Having the lambda sensors unplugged will also cause a lean code and that's what your code will be from! The front one is before the cat and should be plugged in. Without it the car won't be able to run properly and your fuel mixture will be miles away from where it should be!
If you're running a decat, then just fit a spacer on the rear sensor to stop it throwing a code for the cat not working properly.
Last edited:
Similar threads
