What is the solution for Volkswagen P0222 fault code?

[EverettDella]

P2002 fault code indicates that the diesel particulate filter efficiency is below the threshold. It is recommended to check whether the data stream of the oxygen sensor is normal. If it is not normal, simply replace the diesel particulate filter.

[JudahLee]

Just tinkered with this trouble code in my garage. P0222 indicates throttle or electronic accelerator position sensor B circuit voltage too low, quite common in VW vehicles. First check if the pedal sensor connector has water ingress or oxidation - my old Touareg had this issue from car wash leakage. Use a multimeter to measure the voltage on pin 3; it should fluctuate around 4.65V when normally pressing the accelerator. If voltage is abnormal, don't rush to replace the whole assembly - inspect the wiring harness for rodent damage. Last week I helped a neighbor trace it to engine bay wiring melted by the exhaust pipe causing a short; wrapping it with heat insulation solved it. Could also be worn sensor carbon film, which requires replacement. Remember to disconnect power for 10 minutes to reset the ECU - sometimes false alarms just need code clearing.