335i lean code

Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Cost of diagnosing the P code Labor: 1. The auto repair labor rates vary widely across the country, and even within the same city. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream.

When the engine is started, the engine control module ECM operates in an open loop mode, ignoring the HO2S signal voltage while calculating the air to fuel ratio.

While the engine runs, the HO2S heats up and begins to generate a voltage within a range of mV. This voltage will fluctuate above and below the bias voltage.

An HO2S voltage that increases above bias voltage toward 1 mV indicates a rich fuel mixture. An HO2S voltage that decreases below bias voltage toward 0 mV indicates a lean fuel mixture. P More Information Need more information on how to fix the P code? Get Access to Factory Service Manuals.

Related Information. Repair Importance Level: 3. Why is the Engine Light ON?The belt popped on my car, it was replaced, and then it threw a p code. The maf was replaced, and now i have a p and p code.

I know what the codes mean running lean but i still can't find the problem. I made a home made smoke machine, and the only leak seems to be coming from the crankshaft pully. Im not sure if maybe a shard of the belt messed it up. Everything is pointing to a vacuum leak, but there is only the one. Any help would be appreciated on helping me fix this, its been almost a month, its been to a shop, and thy cant fix it either. I have all 3 of these codes. Where is the secondary air pump?

I have a i. Any help would be appreciated. I know this post is very old, but figured maybe someone would know something???? Did you ever figure this problem out? I had the exact same thing happen to me and have the same three codes. Also did a smoke test and had the same result smoke coming from behind the crank pulley.

Did the maf solve the ? When the belt shreds off, parts of it almost always get wrapped behind the crankshaft pulley and damage the front crankshaft radial seal. This causes an air leak in the crankcase system which will cause the lean mixture faults. I would replace the seal. Also, the belt usually slips or shreds off due to leaking oil filter housing gasket, I would double check it to make it's not leaking onto the new belt Sent from BimmerApp mobile app.

BMWoem1 Thank you very much for the reply. I was kinda afraid of that. You definitely hit the nail on the head.Johnny is a longtime online writer and car enthusiast who has expertise in fixing car problems. If your "check engine" light is on, and you've used an OBDII scanner tool to read the fault codes, and they returned P and P, this guide is for you.

Here is a discussion of their meaning and their common causes. Basically because your engine fuel mixture has too much air and not enough fuel in it a lean mixture. A mixture that isn't optimal may be called:. The Engine Control Module measures the amount of oxygen in the exhaust system via the oxygen sensors and makes adjustments by adding more or less fuel to the mixture. When the adjustments become too large to maintain the proper mixture, the fault codes P and P are logged.

They are logged together, since in V8 and V6 and more rarely in some 4-cylinder and straight 6-cylinder cars the cylinders are split into two separate groups, or banks. This is the most likely cause of too much air being taken into the system. The source of a vacuum leak could be one of many things, including but not limited to cracking, wear, or a hole in any of the following:. If any of these parts are not forming a perfect seal have a slit in them then unmetered air will be entering the engine.

Try to listen for a whistle or hiss under the hood with the engine running and visually inspect all hoses and connections. The MAF could be under reporting the amount of air passing through the intake. This seems rather unlikely but worth checking into all the same. This is a case in which air flow is normal but not enough fuel is being delivered. Due to a possible loss of fuel pressure or flow the ECU cannot provide enough fuel to the attain the correct mixture.

If the engine is a V8 or V6 and only one side or bank is reporting a fault code it could be a leaking intake manifold gasket or leaking manifold. If you have logged both codes, however, it is unlikely that a leaking manifold would be the issue since both manifolds would have to be leaking.

It's possible but highly unlikely that P and P codes are the result of faulty O2 sensors.

P0174 BMW - Mixture Control 2 System Too Lean Bank 2

If O2 sensors are causing both P and P banks to report a lean mixture, that would mean that both O2 sensors are misreading the amount of oxygen in the exhaust.

Not a likely scenario. Also, the computer will run validation tests on the readings of the O2 sensors before looking at fuel trim adjustments. Only then would a too-lean mixture be returned and logged as a fault PVisually 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. When is the P BMW code detected?

OBDII Codes P0171 and P0174: Diagnosis

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.

IMPORTANT Maintanence for the BMW N54 Engine (Upgraded Vacuum Lines)

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.

BMW Check Engine Light Codes

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.Below you will find the most complete list of BMW trouble codes available.

The code definitions are a good starting point when determining the cause of the service engine light but where do you go from there? We have a large number of resources to help you repair the problem. Here is how we suggest you proceed. Look up your code definition. This tells you where to start testing. If you are unsure of any abbreviations, check out the acronym list by clicking on the link at the left. Next, read our article Automotive Circuit Testingand if there is an article related to the system you are testing, such as Oxygen Sensors or EGR concerns, read these as well.

They will provide valuable info!

335i lean code

If there is a link to a specific diagnosis strategy for the code then follow that and start testing. If there is no procedure for your manufacturer specific code, then I suggest referring to a similar generic OBD II code these are listed numerically by system type to get a good idea of what to look for.

If at this point you still need assistance use the "Get Help" link and let us know how we can help. We do ask that you please read the info available on the site first so that we can help reduce repeat questions.

So please read our Disclaimer and when you're ready jump in! Also, we value your feedback and like to hear stories of unusual fixes or concerns you may have run into with your Check Engine Light, so feel free to share your experiences by using the "Contact Us" link. Let's go! We do our best to update these BMW check engine light codes as frequently as possible. If you find one missing let us know and we we'll add it immediately! Please use the form on our Contact Page to get in touch with us.

We certainly understand how frustrating it can be to look for a code definition and have it not online when you need it. And lets face it, if the service engine light is on then you need it now!

It's easiest to use the "Find On This Page" feature of your browser's "Edit" menu to find codes on this page as the list is quite long. These are listed in numerical order for easy searching. Connect scan tool to the pin data link connector DLC located underneath the steering column. The connector may have a removable cover. Turn the ignition on. Remember, these are manufacturer specific codes only. Manufacturer Specific Codes.The BMW N54 engine might be the best tuner engine of all time…at least we think so.

Hopefully I can get some Toyota fans to read it so we can stir up some drama. Anyways, back to the point. In fact, the N55 engine was slightly dialed back in an attempt to tame some of the common engine problems of the N Be sure to read our guide on the N54 vs. This post is going to cover the most common N54 engine problems, along with the symptoms and error codes to be able to identify them.

335i lean code

On top of that, I will cover general maintenance tips to reduce the possibility of these engine problems, as well as repair and replacement options in the case that you fall victim.

We will touch on all of these in-depth, focusing on the symptoms of each problem, the performance impact, and the repair options. If you are in the market for an N54 powered BMW and just read that list, you are probably reconsidering your choice.

335i lean code

It definitely did when I was looking for my i…but the substantial difference in tune-ability between the N54 and N55 is what brought me back. My i is a 10 years old already! And my warranty is up. But the truth of the matter is, while some of these problems are inevitable, the majority of them are preventable.

Read on and we will cover each N54 problem.

P0174 BMW - Mixture Control 2 System Too Lean Bank 2

You guessed it, the N54 high pressure fuel pump is responsible for injecting fuel into the engine. The HPFP feeds fuel through the injectors, which directly supplies the engine with gasoline necessary for combustion. If your HPFP fails, your engine will not get the fuel it needs to run. Sounds like a big problem? It is. Fortunately, BMW realized that, and warrantied it for 10 years ormiles.

If you own a higher mileage N54, it is likely that you have had your HPFP replaced at one point in time. These are common codes, certain ones might not indicate a failed HPFP such as a cylinder misfire code. This is a fantastic question. Nor will any other performance part for that matter.

I know a mentioned earlier that most of these common issues are preventable.I got a i w a check engine obd2 code p it stutters a little on the start up what can it be? Its a bank 1 fuel system to rich. Just had my 09 bank one O2 Sensor replaced for that. Verily, bounty and happiness shall follow you in all of your days, with Google as your guide. Me thinks you MAF is either dirty or bad.

OP, my bet is you have a boost leak. Check the charge pipe and any other air ducting for the intake system. A BMW specific scanner may reveal other codes that can help narrow down the culprit. I wouldn't just change it without further evidence. But now for the good news This is an emissions related code and the dealer must fix it on the warranty.

If not, the ball is in their court. Uh, that's not the right probe for N ECU thinkth: 'That's just gotta be a rich mix! Why, lean it out 'til the signal's good. Now excess O2 reads good and your lean mix causes misfire.

Code says Left, engine went Right! Wanna be sure? Switch O2 sensors. Pre-cat - they're the fuel mixture sensors. Pre-cats are wideband; post are narrow! HERE en. Cal, you and Nancy Pelosi get your water from the same reservoir, right?

Just askin'. Yes, you could swap upstream sensors which are code related, not the downstream sensors which generate only cat efficiency codes but that would be a somewhat troublesome job. Nice idea for those with a very tight budget. But for those of us for whom time is money it is a very expensive diagnostic procedure.

Sometimes when you do surgery you need to invest in some surgical instruments. A BMW specific scanner would be a very nice start. My friend, this is a good spot to state a guiding principle: There is no DIY, regardless of difficulty, impediment, or hours spent, that is not worth doing! Do we skin knuckle, or simply drop it off? Do we spend a dollar to save a dime, or pay for expert performance? Whelp, depends on who you are. Me, I like to explore, but I have other vehicles and my Bimmer's not a daily driver.

OP must decide! What are your thoughts, JonDoE60? No sensors were included. I think turbo units as well. I am not real familiar with CA emissions warranty requirements, but I know they both exceed and supercede federal requirements. It was my understanding that downstream sensors on your car are covered in CA.

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