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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The ECU has the ability to slightly adjust the air-fuel ratio if it is rich. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. While removed clean throttle body with approved cleaner. Always check to make sure that there is not a PCM software update due or available. Generally p01722 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.

You can severely damage the engine if something goes wrong. To keep the engine running properly, the powertrain control module PCM tries to vtc for the rich condition by injecting less fuel to the mixture in an effort to maintain the proper 0p172 The following two failures need to be created.

Reading and analyzing fuel trims and the freeze frame data is the key to properly diagnosing P I was about to order one, but then I read this from here: An engine needs to have at least 17 to 18 inches of vacuum in order to run properly. The oxygen sensor is reading incorrectly, and everything is actually fine. When the engine is cold, more fuel is added to help warm it up to a desirable temperature. Fuel Trim System Too Rich.

Mario Hernandez October 22, Thank you fixd I saved a lot of money. Fast and easy Check Engine Light is on Inspection service at your home or office. When will DTC set?

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The Internet leads me to believe that your ignition might be coil on plug, in which case there are no plug wires. By VisitorFebruary 16, The bad O2 readings are a symptom.

I have codes po, and pop up. If check engine light code P persists after you have inspected the p072 intake system and cleaned the Mass Air Flow MAF Sensor, perform a fuel pressure test. Shorted Fuel Injector windings can cause the injectors to spray too much fuel, causing a rich condition.

Not enough air is coming in. Most routinely, the air-fuel ratio will be measured through the oxygen sensors calculating the amount of oxygen and carbon monoxide present xtc exhaust gases.

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 visible material malfunction like fuel pressure regulator, fuel injector, air leakage When these adjustments become too large, a fault code is set.

This test is undertaken keeping in mind that a failure that can exceed the adaptive terms can be generated.

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

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. When the computer determined the air-to-fuel mixture to be too rich, it then set the P172 code. I’m also assuming you don’t have a diesel engine.

Never Overpay Our free estimator calculates a custom price for your vehicle repair. Also, if it is an oxygen sensor – are they all the same?

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

Chris 15 years of experience. P can be caused by a lot of things. Wow, sorry its dfc big! Ideally, the Long Term Fuel Trim should p012 close to 1 to 2 percent. This may come back to life after the excess fuel quits dumping. A proper air-fuel ratio of about When a code P is set, it means that the Fuel Trim is anywhere from percent to as low as percent compensated. The vehicle may have trouble idling, especially when warm or when sitting at a stoplight. You may find, however, since there was an extreme amount of fuel dumped into the system, the O2 I’m assuming this is your new sensor as well may have been damaged in the process.


Code P mainly applies to V6 or V8 engines because 4-cylinder engines generally have only one bank, though there are a few exceptions. Check the MAP reading and then do a manual vacuum reading.

You can test the oxygens sensor to verify this is the fix. The fuel mixture grows rich and eventually, the code sets. Learn how to grow your business with RepairPal. Sign up or log in Sign up using Google.

If the Oxygen Sensor heater element only works intermittently—well enough to pass the readiness test, but fails once the car has been driven for a while—the vehicle will go into “open loop. It is highly recommended to check the condition of the spark plugs and the operation of the coolant temperature sensor. Mechanical engine problems will cause a low MAP sensor reading because engine vacuum is low p172 erratic.

P0172 OBD-II: System Too Rich

Get back on the road. Pay special attention to the fuel pressure regulator and the fuel injectors. If the fuel pressure regulator is stuck, it can cause a rich condition due to the high pressure. That was in relation to another issue, however it confused me enough to doubt whether buying a new oxygen sensor would in fact fix the problem!

A Thermostat stuck in the open position can mechanically cause a code P, especially in cold climates.