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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What exactly is happening when the code sets? To keep the engine running properly, the powertrain control module PCM tries to compensate for the rich condition by injecting less fuel to the mixture in an effort to maintain the proper When Does DTC clear? The engine won’t warm up, preventing it from going into “closed loop” fuel control. Unburned droplets of raw fuel that smell, affect breathing, and contribute to smog CO Carbon Monoxide: Chris 15 years of experience.

When the Mass Air Flow Sensor dyc this Barometric reading, it adjusts its Air Density table and then “over reports” the actual amount of air entering the engine. Post as a guest Name. A technician may not inspect the coolant temperature sensor and cooling system. A proper air-fuel ratio of about Can I order the wrong one for my car or can I just get the cheapest?

The oxygen sensor is reading incorrectly, and everything is actually fine. Recent Check Engine Light is on Inspection reviews.

Here is a great video that clearly explains this process! Max Goodridge 5, 14 35 It is important to complete the entire diagnostic process when diagnosing P Then check the freeze frame information for the code to see which range s failed and what the operating conditions were. Code P applies to Bank 1 and P applies to Bank 2.


Ignition misfires, like mechanical misfires, cause puffs of oxygen to keep hitting the Oxygen Sensors. Low brake fluid could cause the throttle control to kick in when a sudden vehicle movement is System Too Rich Get diagnosis and repair information for trouble code P If the vehicle is not hoisted properly, the fuel return line can be pinched, causing a high Fuel Pressure condition.

When this happens, the computer knows that there is an improper condition in the control of the Fuel System.

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. When the engine is cold, more fuel is added to help warm it up to a desirable temperature. Next, looking at P, which is telling us bank 1 is reading a p0712 rich condition.

I say “pop it in”, but O2 sensors are not the easiest to replace. The bad O2 readings are a symptom. Troubleshoot a car problem Ask a question Free repair estimates Find repair shops Car care advice. When a vehicle has the fault code P and or P, it means that computer can no longer automatically adjust the mixture between air p172 fuel.

There is a very effective “truth test” for any Mass Air Flow Sensor. The car may not be able to pass a state vehicle inspection p01772 of the P code setting the Check Engine Light. Is the dct in closed loop? Is it rich only at idle? Cleaning the sensor might hold off problems for a while, but eventually, the MAF sensor should be replaced.

P DTC: System Too Rich

Guess we dt find a new mechanic. Theodore 13 p072 of experience. Was this cool or helpful? P can be caused by a lot of things. If the fuel injectors are faulty, they could leak fuel into the cylinders rather than delivering the precise amount needed for the air-fuel ratio. Start the engine, let it idle, and then check the Barometric Pressure reading on the scan tool data.


It is reporting that the engine is running too rich, which is what we’d expect if smelling un-burned fuel out the exhaust. Sign up using Email and Password.

An engine needs to have at least 17 to 18 inches of vacuum in order to run properly. Home Questions Tags Users Unanswered. A judicious calibration has already made the tuning but, since the regulation does not approve of such a move it is mandatory to forcibly generate some ddtc material malfunction like fuel pressure regulator, fuel injector, air leakage Wow, sorry its so big!

The vehicle may have trouble idling, especially when warm or ftc sitting at a stoplight. The ECU has the ability to slightly adjust the air-fuel ratio if it is rich. There is one major issue that is likely causing everything else you are experiencing. Shop around for the best dealI will post if thit is the cause.

P0172 – Meaning, Causes, Symptoms, & Fixes

Fast and easy Check Engine Light is on Inspection service at your home or office. The fuel mixture grows rich and eventually, the code sets. This test is undertaken keeping in mind that a failure that can exceed the adaptive terms can be generated.

This particular ratio was chosen because it was discovered to have the highest ;0172 output but lowest fuel consumption rate.