P0172 and P0175 on your Jaguar X-type

P0172 and P0175 are for the banks on the engine are too rich. Let me break it down for you, the ECM (engine computer) is always monitoring the Oxygen sensors. When the oxygen sensors detect little oxygen on the exhaust (little oxygen means too much fuel) for a predetermined period of time then it flags one or both these codes. Which brings us to an important conclusion, if both codes are flagged at the same time then there is a problem that affects both sides of the engine. If only one code is flagged then there is a problem that affects the respective side of the engine. You don't need to know a lot of mechanics and electronics, just follow the guide that follows:

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)