XK8 P0171 and P0174 fauly codes after P0455 fault code
#1
XK8 P0171 and P0174 fauly codes after P0455 fault code
I had a P0455 fault code, I replaced the gas cap, canister close valve and checked the hoses and cannisters. Everything looked good. Now I got a restricted performance message along with a P0171 and P0174 fault code. No more P0455 code. Any suggestions?
I have a 2001 XK8.
I have a 2001 XK8.
#2
Could be your O2 Sensors are reading a bad air/fuel mix; or the O2 Sensors it self is bad.
A code P0171 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor Possible cracked vacuum or PCV line/connection Faulty or stuck open PCV valve Failed or faulty oxygen sensor (bank 1, sensor 1) Sticking/plugged or failed fuel injector Low fuel pressure (possible plugged/dirty fuel filter!) Exhaust leak between engine and first oxygen sensor
Read more at: http://www.obd-codes.com/p0171
Copyright OBD-Codes.com
A code P0171 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor Possible cracked vacuum or PCV line/connection Faulty or stuck open PCV valve Failed or faulty oxygen sensor (bank 1, sensor 1) Sticking/plugged or failed fuel injector Low fuel pressure (possible plugged/dirty fuel filter!) Exhaust leak between engine and first oxygen sensor
Read more at: http://www.obd-codes.com/p0171
Copyright OBD-Codes.com
The following users liked this post:
noterman (07-27-2016)
#3
#5
MAF replacement did not help. I pulled the air cleaner box thinking a mouse might have built a nest in it to cause a lean P0171 and P0174 code. No mouse nest, but I did find my air cleaner element soaked in oil and oil in the bottom of the air cleaner box. Not sure how the oil got in the box. I am now looking at the breather hose, but that's downwind of the filter box.
The following users liked this post:
noterman (07-29-2016)
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