04 chrysler pacifica cylinder missfire 1,3,5
DTC P0172 - System Too Rich (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a rich
condition (too little oxygen in the exhaust). On V6/V8/V10 engines, Bank
1 is the side of the engine that has cylinder #1.
Note: This DTC is very similar to P0175, and in fact your vehicle may show both codes at the same time.
You will more than likely not notice any drivability problems, although there may be symptoms such as a misfire.
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
There could be a vacuum leak.
There could be a fuel pressure or delivery problem
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)
Hope this helps; also keep in mind that your feedback
is important and
I`ll appreciate your time and consideration if you leave some
testimonial comment about this answer.
Thank you for using FixYa, have a nice day.