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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That means that I can’t see how lean the engine is running – that should mean it’s the sensor that’s broken now right?

Too p0712 fuel is being injected. When nearing low fuel, car will lose acceleration power, wheel will lock as well. Now you have to find the root cause of the problem. If you clean and replace the filter and its enclosure as needed, you will prevent the new MAF from failing.

It is important to complete the entire diagnostic process when diagnosing P Some of the high performance 4-cylinder and straight 6-cylinder engines such as those in BMW and Lexus split the cylinders into groups of two or three and call them separate banks.

Low brake fluid could cause the throttle control to kick in when a sudden vehicle movement is Post as a guest Name.

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

Since the oxygen sensors passed their readiness tests and didn’t set any codes, the computer l0172 looked to the Fuel Trim adjustment. There is one major issue that is likely causing everything else you are experiencing. If check engine light code P persists after you have inspected the air intake system and cleaned the Mass Air Flow MAF Sensor, perform a fuel pressure test. A rich condition can also cause misfires from “overfueling” too much fuel for the Ignition Spark to burnwhich puts raw fuel HCs into the atmosphere.


This particular ratio was chosen because it was discovered to have the highest power output but lowest fuel consumption rate. P Diagnosis Tools Needed to Diagnose: Reading and analyzing fuel trims and the freeze frame data is the key to properly diagnosing P When the air ratio goes below It is important to restate that the Oxygen Sensors are accurate—the fuel mixture is too rich.

This is your fuel system. Next, looking at P, which is telling us bank 1 is reading a too rich condition. A worn or stuck wiper in p072 Throttle Position Sensor will tell the PCM that more power is being requested by the operator.

However, it should be noted that a “rich” running engine can also have little or no smell, since CO itself is odorless. Veteran and Military Driver Laws and Benefits in Idaho The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the Is it rich only at idle?

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

A defective Oxygen Sensor can sometimes cause a P When the Mass Air Flow Sensor sees this Barometric reading, it adjusts its Air Density table and then “over reports” the actual amount of air entering the engine. The computer tried to compensate, but since resolution is impossible, it sets the code. The best air-fuel ratio modernly known to man is I’m also assuming you don’t have a diesel engine.

This may come back to life after the excess fuel quits dumping. Before we get into the main causes of P, let’s explore why this code matters.

Wondering how one bank is too lean and other is too rich. If you have a bank that is running too rich, which is unfortunately a very generalized condition, one or more of the following conditions must be true:. An inaccurate Coolant Temperature or Air Temperature Sensor can cause a rich condition because they will report that the engine is still cold, which will cause the PCM to keep the mixture rich long after the engine is at proper operating temperature.


P0172 – Meaning, Causes, Symptoms, & Fixes

There isn’t enough spark to burn the fuel completely. Dtf the engine in closed loop? A proper air-fuel ratio of about Get a quote and book an appointment online or speak to a service advisor at This test is undertaken keeping in mind that a failure that can exceed the adaptive terms can be generated.

When you are driving behind a “rich” running car or truck, it can smell very bad, somewhat like rotten eggs, and make you feel dizzy. Etc the computer determined the air-to-fuel mixture to be too rich, it then set the P code.

If other codes are present, they must be addressed first. Always check to make sure that there is not a PCM software update due or available. 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.

When Dt DTC clear?

There is a very effective “truth test” for any Mass Air Flow Sensor. Here is a great video that clearly explains this process!

A technician may not inspect the coolant temperature sensor and cooling system. It is reporting that the engine is running too rich, which is what we’d expect if smelling un-burned fuel out the exhaust.

I see that this was asked a month ago and got no answers, but on the off chance the poster still needs help or somebody else comes across this, I’ll do my best to answer.

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