If both P0172 and P0175 are flagged:
- Check for restricted air filter, take your air filter out, make sure is not full of dirt, if it is change it. Here is the link: Mann-Filter C 38 116 Air Filter
- Mass air flow sensor:
- You can try and clean this one with some MAF cleaner: CRC 05110 Mass Air Flow Sensor Cleaner - 11 Wt Oz.
- Also you might need to clean your throttle body with some throttle body clean: CRC 05078 Throttle Body and Air-Intake Cleaner - 12 Wt Oz.
- If the codes still come back then you might need a new MAF: Cardone 74-50009 Remanufactured Mass Airflow Sensor (MAFS)
- There are also some rare causes for this code, but I'll just mention them for the sake of completion, but these are not likely your cause:
- Engine Coolant temperature sensor
- Thermostat
- Throttle position sensor
- Engine computer
If only one of the codes is flagged:
- The first thing to try is the oxygen sensors:
- If P0172 is flagged change the bank 1 upstream oxygen sensor: Denso 234-9016 Oxygen Sensor (Air and Fuel Ratio Sensor)
- If P0175 is flagged change the bank 2 upstream oxygen sensor: Denso 234-9016 Oxygen Sensor (Air and Fuel Ratio Sensor)
Very grateful for such a lengthen explanation, i have written this down in my record book for remembrance.. thank you,
ReplyDeleteYeshua Bless you
A.B Robinson
Lots of discussion on this in the Jag forum, seems the culprit is the MAF connector pins, clean, tweak if necessary, reconnect, problem goes away!
ReplyDeleteDO not Clean your throttle body, theres huge warnings in the repair information telling you to never ever clean the throttle body and will risk damage if done.
ReplyDeleteMy xj8 drives great for about an hour after that restricted performance comes then goes away. But then soon after it will start to sputter when I press the accelerate. Received P0172 and P0175 codes along with misfire on cyclinders 1-4. I was thinking oxygen sensor. could it be mass flow sensor?
ReplyDeleteP0172 system too rich bank 1
ReplyDeleteP0175 system too rich bank 2 help please on a 2005 jag s type 3.0 getting these codes , replaced ,fuel filter,MAF sensor,...