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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My Honda Civic EX threw the p0712 code and it turned out to be that my friend installed the timing belt off by 1 or 2 teeth.

P and P – OBD-II Trouble Codes

It is important to restate that the Oxygen Sensors are accurate—the fuel mixture is too rich. When this happens, the computer knows that there is p012 improper condition in the control of the Fuel System.

An engine needs to have at least 17 to 18 inches of vacuum in order to run properly. Is it rich only under load? On a Honda Pilot the MIL continuously throw codes p and p simultaneously never one at a time after reset roughly after 44 miles driven.

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

By VisitorFebruary 16, There isn’t enough spark to burn the fuel completely. High Quality Repairs Your auto repair done right, only the work you need with no add ons. Was this cool or helpful?

Lucas 18 years of experience. For any given failure, it p1072 advised to measure the emission threshold until the legal emission thresholds are exceeded. Cost of diagnosing the P code. Code P mainly p172 to V6 or V8 engines because 4-cylinder engines generally have only one bank, though there are dt few exceptions. I was about to order one, but then I read this from here: Before we get into the main causes of P, let’s explore why this code matters. The best air-fuel ratio modernly known to man is The first step in this program is to obtain A Thermostat stuck in the open position can mechanically cause a code P, especially in p00172 climates.


The ECU has the ability to slightly adjust the air-fuel ratio if it is rich. It is reporting that the engine is running too rich, which is what we’d expect if smelling un-burned fuel out the exhaust. Next, looking at P, which is telling us bank 1 is reading a too rich condition. The computer should automatically adjust the firing time of the injectors to achieve the proper ratio based on feedback from the O2 sensor. 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: Since the oxygen sensors passed their readiness tests and didn’t set any codes, the computer then looked to the Fuel Trim adjustment.

Generally dtf spark failure should be detected by the engine computer and logged as a misfire, especially if it were bad enough to cause a rich condition, so this one seems less likely. Chris 15 years of experience. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you p0712 read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Diagnostic Trouble Code (DTC) P Fuel Trim System Too Rich – United Kingdom | BBA Reman

Never Overpay Our free estimator calculates a custom price for your vehicle repair. Got FIXD and found out it was a different issue.

I say “pop it in”, but O2 sensors are not the easiest to replace. Be sure to “Ohm check” the injector winding resistance as well in order to verify that it’s within specification.


Number of Reviews 3, However, if the margin of compensation is too large, then a P code will likely set. Immediately fixed my problem and ;0172 a thorough inspection, ensuring I was satisfied.

Fuel Trim System Too Rich. You can test the oxygens sensor to verify this is the fix. Home Questions Tags Users Unanswered. The engine won’t warm up, preventing it from going into “closed loop” fuel control. Duane 22 years of experience. Reading and analyzing fuel trims and the freeze frame data is the key to properly diagnosing P By Heatman72June 06, 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.

It is around a Hour Job. A technician may not inspect the coolant temperature sensor and cooling system. However, it should be noted that a “rich” running engine can also have little or no smell, since CO itself is odorless.

P0172 OBD-II: System Too Rich

P Determining the limit good and the limit bad for each kind of failure therefore becomes mandatory. A worn or stuck wiper in the Throttle Position Sensor will tell the PCM that more power is being requested by the operator.

A defective Oxygen Sensor can sometimes cause a P Low brake fluid could cause the throttle control to kick in when a sudden vehicle movement is When o0172 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. When these adjustments become too large, code P is triggered.