- P0171 means that the oxygen sensor reads that there is too much air compared to the fuel coming out of the bank 1 tailpipe.
- P0174 means that the oxygen sensor reads that there is too much air compared to the fuel coming out of the bank 2 tailpipe.
If both codes are flagged, that means that there is a problem on both sides, which is almost always the case. These cars have a lot of problems with vacuum leaks but most are easily repaired. Here is a picture with the most common problems. I recommend changing all that haven't been changed before because these parts are relatively inexpensive and easy to fix.
If that doesn't fix your problem, then your most likely cause is a bad Mass Air Flow sensor. Check the link below:
I have a 2003 Jaguar X-Type and I am getting P0174 only, where is this tailpipe 2 located ? Is it on the driver's side of the manifold ?
ReplyDeleteP0174 is for bank 2 and is located towards the front of the car. Is the "easy" bank.
DeleteHow easy is it to change these parts myself?
ReplyDeleteVery easy in my opinion!
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ReplyDeleteI recently replaced 4 oxygen sensors and oil gasket on my car along with the vaccum seals you talked about. I still have P0171 and P0174 codes. I had no codes before replacing all the 4 oxygen sensors. I have a hissing sound near the brake booster vaccum hose could that bea reason or is it a bad MAF ?
ReplyDeleteAny help is greatly appreciated
I have 03' xtype , 133K miles on it runs smooth
Thanks for the great information. I had no clue about replacing the Vaccuumm seal as Im a computer engineer but foudn this information and did it myself. Thanks a lot again.
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ReplyDeleteMy 2002 X-type 2.5. Has PO171,PO174, PO332 and P1643 when I checked the codes it also showed engine control module/transmission module circuit network, also fuel volume regulator circuit open.It is driving in I believe limp mode and in the driver information window says fault in gearbox,cruise unavailable.The brakes take alot of pressure to work I believe because the brake servo isn't working,I don't know if that is because of a vacuum leak but for the servo to not work due to leak I believe there would have to be a real bad vacuum leak and I would hear it.I just recently bought the car and this has all happened since purchase.When I reverse there is a noise as if the brakes are releasing this is after the car is parked suggesting they are not releasing when I release the handbrake this doesn't happen going forwards and needs alot of revs to move so I always back out of my drive and don't use parking brake except in my driveway. I found receipt in the glove box for replacement brake pads and a couple of other parts on the receipt is written jag parts also the only way I can start the car with the key is to clear the codes otherwise the key turns the lock but doesn't start the car. This is my only vehicle and I cannot afford a big bill at a dealership,I have worked on cars all my working life and did an apprenticeship with a Rolls Royce dealership in Perivale, England where I grew up but these totally computer operated cars have me beat I included this to show I have a background of automobile repairs both mechanical and bodywork I retired 24 years ago due to back injury and now live on social security.
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