8/6/2023 0 Comments P0171 chevy trax![]() P0171 definition : Bank 1 has too much air or not enough fuel – This will typically trigger your Check Engine Light.This certainly holds true when speaking of a p0171 trouble code.īy taking your time, and carefully determining the root cause of such an issue, you will save money and have your car, truck, or SUV back on the road in no time. Read More > Which Spark Plugs Actually Increase Fuel Economy? Taking Matters Into Your Own HandsĪlthough the appearance of a check engine light is indeed aggravating, a few hours of work and a methodical diagnostic approach is often all that is needed to fix what ails your vehicle. A failed sensor can trick a vehicle’s ECM into falsely adjusting fuel trims. If a failing MAF sensor or fuel pressure sensor is noted during diagnosis, replace the affected components. If such a leak is discovered, make any necessary repairs. Step 3: Fix Upstream Exhaust LeaksĮxhaust leaks that are upstream of a vehicle’s O2 sensor can provide that sensor with false readings. If an injector functionality test is failed, clean or replace the affected injector. This often includes a faulty fuel pump or a clogged fuel filter. If poor fuel pressure is discovered, seek out the underlying issue, and conduct repairs accordingly. If an engine cannot receive the desired amount of fuel, it will never obtain the proper air-to-fuel ratio. Therefore, it is important to repair any such leaks that are discovered. The introduction of this unmetered air typically stems from a damaged vacuum hose or leaking intake gasket. One of the most common sources of a p0171 diagnostic trouble code is the introduction of unmetered air into an engine. Read More > What Does Error Code P0011 Mean & How Do You Fix It? How Do I Fix An p0171 Code? You can also use a scan tool to monitor the data from these sensors, checking for out of range values. ![]() Check your MAF sensor and fuel pressure sensors in the manner described by factory service literature. If your vehicle has passed every test up to this point, a faulty sensor is likely to blame. This test can be done with the assistance of a smoke machine, similar to how it is conducted during an intake leak test. Step 4: Check For Pre-O2 Sensor Exhaust LeaksĬheck for the presence of any exhaust leaks upstream of your vehicle’s first O2 sensor on the affected bank. If you have access to a bi-directional scan tool, now is also a good time to run injector functionality tests. These specifications can be found in service literature for your vehicle. This will be done with a mechanical fuel pressure gauge that is hooked into the fuel system at its designated fuel rail port.Ĭheck pressures against factory specifications for your model. If you are yet to discover an obvious problem, you will need to check your vehicle’s fuel pressure. You can either use a vacuum gauge to check for an inability to hold vacuum, or you can use a smoke machine to watch for any damaged intake manifold gasket, lines, or hoses. ![]() If no other codes are found, the first order of business is to check for vacuum leaks. Additional codes outside of the predetermined p0171 code can point you in one specific direction over another. Prior to performing additional checks, it is important to use a scan tool to check for the presence of any additional codes. Since there are a number of possible root causes related to the onset of a p0171 fault code, it is important to accurately diagnose the problem at hand before moving forward with any repairs, The following process will assist you in quickly and accurately identifying the source of your trouble. Read More > What Does Error Code P0420 Mean & How Do You Fix It? However, your vehicle may experience a lack of performance, rough idle, and unresponsive acceleration.Ĭheck out this article for more information about a p0171 OBD II code and how to fix it. ![]() Many “lean” conditions do not lead to any observable drivability complaints. Such an issue can cause false readings and unreliable inputs to factory ECM software, in turn causing the ECM (engine control module) to call for incorrect adjustments in fuel and air delivery. The most common of all p0171 electrical-based faults are dirty or damaged MAF (mass airflow sensors). Some of the most common mechanical causes of a p0171 error code are dirty or clogged fuel injectors, restricted fuel delivery supply or low fuel pressure, leaking vacuum lines or PCV hoses, cracked intake ductwork, and leaking intake gaskets. Any issue, mechanically or electronically, that can cause stifled fuel delivery or unmetered air intake can lead to a lean condition. Several factors can contribute to a p0171 trouble code being set. Read More > What Does The Service Engine Soon Light Mean? What Caused The p0171 code (Possible Symptoms)? ![]()
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