The check engine light error code PO172 means that the system is too rich. The reason why the system is to rich is due to the mass air flow sensor being dirty or faulty.
System too rich bank 1
The error code means "bank one fuel too rich". Too much gas spraying in (for a number of possible reasons)
I have a 2004 Acura rsx type s check engine light is on has code po172 how do I fix it n what r the possible causes
System too rich bank one, check the following link for more info. http://www.obd-codes.com/p0172
This is a code for "system too rich Bank 1". To me it sounds like the first step would be to block the evap flow to the engine and see if the po172 code stays cleared! If it does then I'd suspect a valve/solenoid in the evap system isn't staying sealed and causing the engine to run too rich which is also a cause for a po455 dtc! the 1451 dtc points to an issue with the cannister vent solenoid which could be causing all 3 codes.
If you have not changed the Oxygen sensors I would do that. The O2 sensors ( which are a maintance item) need to be replaced when you have incorrect fuel delivery problems. Mark I had the same codes on my 96 Silverado and it was my fuel pump. Usually your 02 sensors will have a {no activity},{no response} or {heater circuit malfunction} when they are bad.
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