Code p0171

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. A lean condition occurs when the engine either receives too little fuel or too much air. Refer to our Oxygen Sensor Code Diagnosis article for a list of all possible causes.

When the code says that the Fuel System is too lean, it means that the computer has been adding more and more fuel, which is called Long Term Fuel Trim. Both of these codes reference a number that is given to you when you plug your truck into a OBDII scanner. How to fix intake manifold gasket leak. This code signifies that the air-fuel mixture ratio in the engine is unbalanced.

It is either due to fuel being too little or air being too much. Another term associated with the code is “system too lean (Bank 1)”. The lean condition could be one of several possible causes. The intake gasket could be leaking, in which case, the intake has to be remove and the gaskets replaced.

I clear codes, they come back after. The leans codes can be caused by a vacuum leak, contaminated Mass Air Flow Sensor, sticking Evaporative Emission Purge Valve or low fuel pressure. Since you do not have any drivability issues, low fuel pressure is not the problem.

The most common causes we have seen are. L equipped car, pick up, van or SUV. So, Your System Is Too Lean, Eh? Learn more about the error and how to fix it here.

Nearly all Toyota gasoline engines strive for a 14.

What does this code mean anyway? Today we’re discussing a common code that might show up when using your wifi OBDdiagnostic tool, or bluetooth OBDII scanner. Causes, Symptoms, Severity and Cost.

Generally, a lean code will cause the engine to run poorly, which the driver will notice as a high idle, a misfire, a lack of power, or even engine stalling, and this may happen before the check engine light has turned on. The check engine light just recently came on a. L vI was told it could be spark plugs so I changed them then was told it could be possible o2. Auto Service Costs Find the prices for normal auto service activities including alignment, tuneup, timing belt replacement and more.

All your codes are reated to air fuel ratio conerns. My suggestion at first will be to spray clean the MAF sensor, make sure the air filter is clean, and look and listen for any vacuum leaks. Explanation: A lean code is enabled when the computer has detected enrichment adjustments have maxed out, with no , this inability triggers the lean code.

The second code is for a faulty rear Osensor. Being you have the lean code , I would try to repair that first. Hey guys, I figured I would go at this a second time with a little more educated a post.

See how to fix your MAF sensor problems in minutes with this simple product. You can confirm the engine is running lean by looking at Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT). Other than that the car drives good. The fuel trim is the correction the engine computer makes to the amount of fuel it allows to go into the engine to compensate for the readings it gets from the oxygen sensor.

My has thrown that code twice, both times it took about minutes to locate the split vacuum hose under the hood. Once was a funky hose that required a trip to an Audi parts counter, one was a typical vacuum hose I got from my local parts place. It is often caused by intake air leaks, faulty fuel injectors and exhaust gas leaks.

The dealer replaced the mass air flow sensor. It is the case, however, that the system does work by vacuum lines - the vapors are fed into the intake that way. Depending on the year (which you didn’t mention) you might just be seeing two different problems from the same kind of course - really ol dried up vacuum tubing. A positive FT value indicates that the ECM adds fuel to compensate for the lean mixture. A negative FT value indicates that the ECM limits the amount of fuel to compensate for the rich mixture.

We only reference Bank since we do not have a Bank 2. It indicates a lean mixture. I found the hose clamp on the air duct hose that connects the ic to the tb was really loose and the back worked its self off a little. Fixed that and cleared out the code with the ap.

I will update this post as I take pictures, and make additional DIY posts and add links to them here.

Look Up Quick Now! There is a Technical service bulletin on this code. Here is something else that happened to me. This is not telling you that the sensor itself is faulty though it could be.

The code tells you the fault detected by a sensor. Best Answer: OK the problem with the ford trucks with the 4. Hello everyone this is my first post here but I have ran into my first CEL and looking for a little help. My mods are a green filter, Boomba BOV, RMM, symposer delete, and a Roush cat back.