Technical Description
System Too Rich (Bank 2)
What does that mean?
This diagnostic trouble code (DTC) is a generic powertrain code, which indicates that it applies to OBD-II equipped vehicles. Although it is a generic code, the specific repair steps may vary depending on the make and model of the vehicle.
In simple terms, this means that an oxygen sensor in bank 2 has detected a rich condition, indicating that there is too little oxygen in the exhaust. On V6/V8/V10 engines, Bank 2 refers to the side of the engine that does not have cylinder #1.
Note: This DTC is very similar to P0172, and it is possible for your vehicle to display both codes simultaneously.
Symptoms
You will most likely not notice any drivability problems, although there may be symptoms such as a misfire.
Causes
A code P0175 may indicate that one or more of the following issues have occurred:
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 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, and replace them if necessary
Clean the MAF sensor. Consult your service manual for its location if you need assistance. It is recommended to remove the sensor and spray it with electronics cleaner or brake cleaner. Be careful not to damage the MAF sensor, and ensure that it is dry before reinstalling
Inspect fuel lines for cracks, leaks, or pinches
Check the fuel pressure at the fuel rail
Check the fuel injectors, as they may be dirty. Use fuel injector cleaner or have them professionally cleaned/replaced.
Check for an exhaust leak before the first oxygen sensor (although this is unlikely to be the cause of the problem, it is still worth checking)
