P0172 Code - System Too Rich Bank 1

Discussion in 'P - Powetrain Codes' started by fault code, Dec 11, 2017.

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  1. fault code

    fault code Administrator Staff Member

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    What Does P0172 Mean?

    P0172 indicates that there is too much gasoline being detected in the exhaust gases exiting the combustion chamber. The ECU uses a number of instruments, such as the mass air flow sensor (MAF), oxygen sensors, and manifold absolute pressure (MAP) to monitor the air-fuel ratio of the engine.

    Most routinely, the air-fuel 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 14.7:1. 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 P0172 code will likely set. The term “rich” in this case means that there is too much gasoline and not enough oxygen detected in the air-fuel ratio of the engine.

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    What are the common causes of P0172 ?
    • Faulty front heated oxygen sensor
    • Ignition misfiring
    • Faulty fuel injectors
    • Exhaust gas leaks
    • Incorrect fuel pressure
    • Faulty Mass Air Flow (MAF) sensor
    What are the symptoms of P0172 ?

    You will more than likely not notice any drivability problems, although there may be symptoms such as a misfire.

    How do you troubleshoot P0172 ?

    Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector.



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