These two pumps work in unison, so the correct quantity of fuel is injected directly into the cylinder. You still have an electric pump in the tank, but a high-pressure fuel pump is on the engine. If you’ve followed the steps above and are still experiencing Ford check engine code P0420, please contact the FIXD Mechanic Hotline if you’re a FIXD Premium subscriber or find a RepairPal certified shop near you for proper diagnosis and fair pricing.Modern gasoline direct injection (GDI) engines have two fuel pump opportunities. If these codes or any other codes are present, they should be addressed first. Also, make sure you don’t have codes P0174, P0171, P0172, or P0175 which can mean the engine is running rich or lean, which can burn out your catalytic converter. If the catalytic converter is replaced without repairing the misfire, the new catalytic converter will go bad again.
Do not overlook other codes that are paired along with P0420. While this is a possibility, the most common problem is a faulty catalytic converter. Oftentimes, this code is thought to be a faulty O2 sensor or A/F Sensor. If the voltage of the downstream O2 sensor is constantly jumping between 0.1V and 0.9V, the catalyst is worn and the catalytic converter needs to be replaced. The downstream O2 sensor produces a relatively steady voltage reading of approximately 0.45V if the catalytic converter is functioning properly. With the vehicle running and at normal operating temperature, use the FIXD live data feature or a digital multimeter to check the voltage reading of the downstream O2 sensor. If any leaks are found, repair the leak, clear the code, and complete several drive cycles to verify that was the fix. Pay close attention to the exhaust manifold, gaskets, and exhaust pipes pre-catalytic converter. STEP 2: EXAMINE THE EXHAUST SYSTEM FOR DAMAGE AND LEAKS. If other codes are present, they must be addressed first. Use FIXD to scan your Ford to verify P0420 is the only code 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 P0420 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). It’s impossible to give an accurate estimate without properly diagnosing the issue first. P0420 can be caused by anything from a bad sensor to a failed catalytic converter. > Find a RepairPal Certified Shop Near You How Much Does It Cost to Fix Ford Code P0420? 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 you’re having catalytic converter issues and you’re not comfortable diagnosing this issue at home, we recommend finding a RepairPal certified shop nearby to pinpoint the problem and give an accurate estimate for repairs. The first step is to get it diagnosed to figure out what is causing the catalytic converter fault. Leaded Gasoline (the root cause of converter failure).Rich or Lean air-fuel ratio (the root cause of converter failure).Misfire (the root cause of converter failure).Worn or internally failing catalytic converter (Most Common).It’s important to look for other codes that could indicate the root cause of converter failure, such as misfires or an incorrect air-fuel ratio. The most common reason for check engine code P0420 is catalytic converter failure, but there are other potential causes for this code.
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