Definition of error code P and P – System too Rich (Bank 1 and Bank 2) . Read emissions expert information and diagnostics for fault code P and. Diagnostic Trouble Code (DTC) P Fuel Trim System Too RichDiagnostic Trouble Code (DTC) P Fuel Trim System Too Rich – United Kingdom | BBA. The fact that it’s throwing that code means that it’s trying and unable to adjust sufficiently to keep the air/fuel ratio correct. 2 is easy to check-.

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This can happen for multiple reasons and dtv mechanic needs to diagnose the specific cause for this code to be triggered in your situation. P is a trouble code that is set when the ECU senses that there may be too much gasoline present in the air-fuel mixture of the engine.

A proper air-fuel ratio of about P indicates that there is too much gasoline being detected in the exhaust gases exiting the combustion chamber.

P0172 OBD-II Trouble Code: System Too Rich (Bank 1)

The ECU uses a number of instruments, such as the mass air flow sensor MAF rtc, oxygen sensors, and manifold absolute pressure MAP to monitor the dct ratio of the engine. Most routinely, the rtc ratio will be measured through the oxygen sensors calculating the amount of oxygen and carbon monoxide present in exhaust gases. The best air-fuel ratio modernly known to man is This particular ratio was chosen because it was discovered to have the highest power output but lowest fuel consumption rate.


The ECU has the ability to slightly adjust the air-fuel ratio if it is rich. However, if the margin of compensation is too large, then a P code will likely set. A technician may not inspect the coolant temperature sensor and cooling system. When the engine is cold, more fuel is added to help warm it up to a desirable temperature.

If the coolant temperature sensor is not sending the proper signal there is a possibility that the engine ECU may assume that it is always running cold. The car may not be able to pass a state vehicle inspection because of the P code setting the Check Engine Light. If the the air-fuel ratio is rich enough, a black smog will come out of the exhaust, which is harmful to the environment.

Diagnostic Trouble Code (DTC) P0172 Fuel Trim System Too Rich

It is highly recommended to check the condition of the spark plugs and the operation of the p017 temperature sensor. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle.

Get a quote and ;0172 an appointment online or speak to a service advisor at With YourMechanic you can skip the auto shop altogether. They send certified and screened mechanics straight to your door and enable you to save big on car repair and maintenance. System Too Rich Bank 1.

Cost of diagnosing the P code. Fast and easy Check Engine Light is on Inspection service at your home or office. What Causes Hoses to Leak? Recent Check Engine Light is on Inspection reviews.


13C-DTC P System too Rich

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P – Meaning, Causes, Symptoms, & Fixes – FIXD Automotive

There is one major issue that is likely causing everything else you are experiencing. This is your fuel system.

When it gets low, How can we help?