This code is set when the correlation between the throttle pedal and the throttle valve don’t match. If these guidelines are not met, the PCM places the car in a default forced engine shutdown mode for safety reasons. For this reason, the PCM follows some very strict guidelines to insure the system is operating correctly. It is possible the PCM could open the throttle valve and cause the vehicle to accelerate dangerously against the driver's commands. There isn’t a direct connection between the throttle pedal at your foot and the throttle valve. The throttle actuator on modern vehicles is electrically controlled.
This code is set when the PCM (Powertrain Control Module) has failed or the PCM has detected one or more problems that could result in a safety issue from incorrect throttle control. If you’ve followed the steps above and are still experiencing a lean engine condition and Ford P0171 code, please contact the FIXD Mechanic Hotline if you’re a FIXD Premium subscriber or find a RepairPal certified shop near you to get the right repairs at a fair price.Throttle Actuator Control System (TAC) - Forced Engine Shutdown What the P2105 code means Reading and analyzing fuel trims and the freeze frame data is the key to properly diagnosing P0171. Many people will replace the air-fuel sensor or O2 sensor as soon as they get a bad reading, but the root cause is often a dirty or faulty mass airflow sensor or vacuum leak, thus causing the O2 or A/F sensor to read differently to compensate. It is important to complete the entire diagnostic process when diagnosing P0171. If there is a white haze or crust on the tip of the spark plugs (near the diode that screws into the engine), then you should replace all of the spark plugs. STEP 7: INSPECT AND REPLACE SPARK PLUGSĪfter you repair the cause of your P0171 code, inspect the spark plugs.
FORD ENGINE CODES P2173 HOW TO
> How to check fuel injectors with a digital multimeter STEP 6: REPLACE AIR-FUEL AND/OR O2 SENSORSĪt this point if the code still persists you may want to consider replacing your A/F sensor or O2 sensors. Also, check that the fuel injector wiring is not damaged and is connected properly. Random misfires can be a sign of faulty or clogged fuel injectors that need to be replaced.
> How to clean your MAF sensor STEP 4: INSPECT EXHAUST SYSTEM.Ĭheck the exhaust system components for leaks before the Air Fuel Ratio Sensors or Oxygen sensors if you find any leaks have them repaired. Remove the mass airflow sensor and clean the sensor using mass air flow cleaner or contact cleaner. STEP 3: INSPECT MASS AIR FLOW (MAF) SENSOR. If you suspect a vacuum leak but are having trouble finding it, check out this detailed guide to finding vacuum leaks. If a leak is present, you will hear a hissing sound, though it may be difficult to hear with the engine running. Inspect all vacuum lines and hoses for leaks, and make sure they are properly connected. If other codes are present, they must be addressed first. Use FIXD to scan your vehicle to verify the Ford P0171 code is the only DTC present. STEP 1: USE FIXD TO ENSURE NO OTHER ENGINE CODES ARE PRESENT. Tools/parts needed (our top picks from Amazon): This repair requires mechanical knowledge and is not recommended for beginners. From there, a shop will be able to give you an accurate estimate for repairs to fix your P0171 code. Many, if not most, shops will apply this diagnosis fee to any required repairs if you have them perform the repairs for you. Depending on the shop’s labor rate, this typically costs somewhere between $75-$150. If you take your car to a shop for diagnosis, most shops will start with an hour of “diag time” (the time spent in labor diagnosing your specific issue). > Find a RepairPal Certified Shop Near You How Much Does It Cost to Fix Code P0171? These shops can not only help you figure out what’s going wrong before you waste time and money on the wrong parts, but they also offer a minimum 12-month, 12,000-mile warranty and stand behind all their estimates with guaranteed fair pricing. If your engine is running lean and you’re not comfortable diagnosing this issue at home, we recommend finding a RepairPal-certified shop to pinpoint the problem and give an accurate estimate for repairs. Using the live data function of the FIXD sensor and app allows you to read and analyze fuel trims to properly diagnose a P0171 code. With a Ford P0171 code, the first step is to get it properly diagnosed to figure out what is causing the engine to run lean.
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