A code P0172 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 can 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. There could be a fuel pressure or delivery problem Possible Solutions Possible solutions include: Inspect all vacuum and PCV hoses, replace if necessary Cleanthe MAF sensor. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling Inspect fuel lines for cracks, leaks, or pinches Check the fuel pressure at the fuel rail Check the fuel injectors, they may be dirty. Use fuel injector cleaner or get them professionally cleaned/replaced. Check for an exhaust leak before the first oxygen sensor (this is unlikely to cause the problem, but it is possible)
cylinder # 2 misfire
Trouble code P0562 means: System Voltage Low
Trouble code P0320 means:Ignition/Distributor engine speed input circuit malfunction
Trouble code P0403 means: Exhaust Gas Recirculation Control Circuit
Trouble code P0551 means:Power steering pressure sensor circuit range/performance
Trouble code P0441 means:Evaporative emission control system incorrect purge flow
Trouble code P0171 means: Fuel System Lean (Bank 1)
Trouble code P0403 means:Exhaust gas recirculation circuit malfunction
Trouble code P0501 means:Vehicle speed sensor range/performace
Trouble code P0630 means:Vin not programmed or mismatch-ECM/PCM
Trouble code P0201 means:Injector circuit malfunction-cylinder 1
Trouble code P0700 means:Transmission control system malfunction