Bmw code p0172

This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.

Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. P is a trouble code that is set when the ECU senses that there may be too much gasoline present in the air-fuel mixture of the engine.

A proper air-fuel ratio of about P 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 MAFoxygen 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 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 P code will likely set. A technician may not inspect the coolant temperature sensor and cooling system. When the engine is cold, more fuel is added to help warm it up to a desirable temperature.

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. The car may not be able to pass a state vehicle inspection because of the P code setting the Check Engine Light.

If the the air-fuel ratio is rich enough, a black smog will come out of the exhaust, which is harmful to the environment. It is highly recommended to check the condition of the spark plugs and the operation of the coolant temperature sensor. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at With YourMechanic you can skip the auto shop altogether.

They send certified and screened mechanics straight to your door and enable you to save big on car repair and maintenance. Cost of diagnosing the P code.

P0172 – Meaning, Causes, Symptoms, & Fixes

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P code. Recent Check Engine Light is on Inspection reviews. Excellent Rating. Average Rating 4.This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. This code will set when the ECM can not compensate for the amount of air or fuel required to return the air fuel ratio back to the set parameters.

bmw code p0172

For gasoline powered engines, the most fuel efficient and cost efficient air fuel ratio is This ratio also creates the maximum amount of power during the combustion process. The combustion process is very simple yet fragile.

In most vehicles, there are four to eight combustion chambers within the engine. The spark is delivered to each combustion chamber a nanosecond after the air and fuel reaches the chamber to ignite it.

There is a piston in each combustion chamber; each piston is forced down by the combustion at a rapid rate, and at different times. The difference in the timing of each piston is determined by the air fuel ratio and the timing of the engine. Once the piston is down, it must return to the up position in time for its next combustion process.

The piston is forced back up little by little each time one of the other cylinders undergoes its own combustion process because they are all connected to a rotating assembly known as the crankshaft. If something in this process goes out of sequence, internal engine components will work harder and work against each other, or the engine may even not run at all.

In the case of code P, there will likely be higher gas consumption, as the ECM has detected that there is too much fuel being used. Uses a scan tool to read the engine temperature, then compares the findings to an infrared thermometer. A system that is running too rich will force the catalytic convertor to filter out more pollutants, which will shorten the lifespan of the catalytic convertor.

Improper air fuel ratio causes the engine to work harder, which will shorten the lifespan of the engine.

Simple Fix P0172 P0175 Code

I strongly suggest verifying that the cooling system of the vehicle is working correctly. If the vehicle is running abnormally cool, the engine will always run in a rich condition. This is because the ECM is designed to run at a rich rate when cold to help warm the engine up faster. If the coolant temperature sensor is faulty or the thermostat is stuck open, the vehicle may never reach a warm temperature, which will cause it to always run in a rich condition. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle.

Get a quote and book an appointment online or speak to a service advisor at With YourMechanic you can skip the auto shop altogether.Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of When the upstream oxygen sensor detects there are less than 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 these adjustments become too large, code P is triggered.

It is okay to drive a vehicle with P for a short period of time, but driving with this code for an extended period of time can cause internal engine damage and failure of the catalytic converter. It is important to complete the entire diagnostic process when diagnosing P Reading and analyzing fuel trims and the freeze frame data is the key to properly diagnosing P For error code P, one or more of the below repairs may be needed to solve the underlying issue.

For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair. Got FIXD and found out it was a different issue. Guess we gotta find a new mechanic. Thanks FIXD! 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.

So what should be added to the check list is the following items in terms of difficulty. While removed clean throttle body with approved cleaner.

So now I am left with another task that is not listed. It is around a Hour Job. You can severely damage the engine if something goes wrong. Shop around for the best dealI will post if thit is the cause.

bmw code p0172

I have an 04 Honda Accord V6 and engine light came on. Got a diagnostic code of P What is that?

bmw code p0172

I was told to change the air filter. Does that sound right? Thanks for narrowing it down, i got the code from a automotive parts store, and gave me a huge list of what parts it may be 13 in total. O sleeper. Yes No View My Garage. For the past few weeks, my ci has been idling a little rough for the first seconds after starting.

After it warms up a bit, it runs perfectly fine. Today, I went out and started the car and it was running god aweful. It acted like it was going to die, and I heard a popping sound twice, like the car was backfiring-misfiring.

After about a 30 second warm up, the car acted perfectly normal. Any ideas? I've got a guess or two, but I'll hold off until someone that knows more than me puts there opinion in. Remove Advertisements. Cheap and easy if you are careful From the web site: What does that mean? Basically this means that an oxygen sensor in bank 1 detected a rich condition too little oxygen in the exhaust.

Note: This DTC is very similar to P, and in fact your vehicle may show both codes at the same time. SymptomsYou will more than likely not notice any drivability problems, although there may be symptoms such as a misfire. Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.

There could be a vacuum leak. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling Inspect fuel lines for cracks, leaks, or pinches Check the fuel pressure at the fuel rail Check the fuel injectors, they may be dirty.

Check for an exhaust leak before the first oxygen sensor this is unlikely to cause the problem, but it is possible. Thanks for the info. The first thing I did was clean the MAF and replace the air filter and threw a bottle of sea foam in the tank for good measure.

Next is checking the Vacuum line Not sure how to do that at home. Originally Posted by GaryDZ.There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.

BMW P0172 Fuel Injection System Too Rich Bank 1

There could be a vacuum leak. The list of automotive Makes at the right edge of the screen. Enter the 5 character trouble codes in the search box and submit the search. If your OBD-II trouble codes are for a different car, select that vehicle series before searching for the diagnostic codes because not all OBD2 codes used by one manufacture are used by the other makes.

The information contained on this site is presented for informational purposes only. We are not responsible for any actions you take on your vehicle. If you have any doubt as to repairs on your vehicle, please contact your technician. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.

Search for: Search. What does this mean? There could be a fuel pressure or delivery problem. Check for an exhaust leak before the first oxygen sensor this is unlikely to cause the problem, but it is possible. Note: 1. Leave a Reply Cancel reply Your email address will not be published.I read couple forums which say that it a dirty air filter.

I cleaned it and I am still getting the code. What else could be giving me these codes. I hate to be a search nazi but please use the search feature. There are threads that have completely covered your problem. You will find more useful info by searching.

These are more rare than the way too common lean codes and Your car is reading a fuel RICH condition on both banks all 6 cylinders. Common causes would be bad 02 sensors though they usually throw codes for themselves or a bad MAF.

Could also be a busted fuel pressure regulator. Eliminating that is easy, your fuel rail has a port for a gauge right in front, just rent one and see what it says. That is where I would start. Ok the O2 sensors are only 5 months old, MAF is a year old and the fuel filter is 2 months old.

So that's why I am so lost. Did u clean the MAF in this process too? With the oiled filters you should clean the MAF every time you clean the filter. Best to oil it and let it sit overnight. Don't drive on it right away or you'll need to clean the MAF again. And I actually had the filter sitting for 3 days before I put it back in the car.

I'd clean the maf and run it with a normal filter first.

bmw code p0172

Test fuel pressure on the rail, your regulator could be bad. It could also be spark plugs, if they aren't fully firing you would get rich codes. Pull a few and see how they look. The spark plugs are also new, about 3 months old. I got the car with out the original air box.Visually inspect the related wiring harness and connectors.

Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter.

If the problem persists the front oxygen O2 sensor may need to be replaced. What does this mean? The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type.

P0172 – Meaning, Causes, Symptoms, & Fixes

When is the P BMW code detected? The mixture ratio is too lean. The Engine Control Module ECM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large The actual mixture ratio is too lean. Get Access to Factory Service Manuals. Need more help? Get the P Bmw code diagnosed by a professional: Find a repair shop in your area. Related Information. Leave a comment below or tell us if the information above help you fix the code.

What are the symptoms on your vehicle for the P Bmw code? Have you replaced any parts? Any information is appreciated. Repair Importance Level: 3. Why is the Engine Light ON? Home - About AutoCodes. Posted and Edit by AutoCodes.


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