![]() Replacing sensors or components without any indication of a problem with the sensors or components. If at this point the vehicle is still setting the same code, you may have a more serious problem with your car’s oxygen sensor system, and you should bring the vehicle to a certified shop to have further diagnostic work performed. If it doesn’t click or move, replace the tested oil control valve and test drive to see if the concern is resolved. (Do not leave power applied for more than a second or two) If the valve is functioning properly it should click, and you may even be able to see the valve move based on the design of your specific valve. You can do this by removing the Oil Control valve and supplying power and ground to the solenoid quickly using a pair of fused jumper wires. If there isn’t any sludge, consider checking the Bank 2 Intake Camshaft Oil Control Valve for proper function. If there is sludge, there is a good chance the engine will need to be replaced due to sludge blocking the oil passages to the Oil Control Valve(s) STEP 3: CHECK OIL CONTROL VALVE. Remove the oil cap and/or the valve cover and inspect the valve train for sludge. If it’s dirty, change the oil and filter and test drive to see if the concern is resolved. If it’s low, adjust to spec and test drive to see if the concern is resolved. STEP 2: CHECK FOR OIL SLUDGE.Ĭheck the engine oil level and condition. ![]() Use FIXD to check if there are any other codes along with P0020. 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. Complete diagnosis may require some specialized equipment beyond what the FIXD Sensor can provide, but for the most part, this diagnosis and repair can be attempted by beginner DIYers. If you’d like to try to fix code P0021 at home without throwing money at parts, you’ll want to follow the steps below for proper diagnosis.
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