Diagnostic trouble code (DTC) P051B stands for “Crankcase Pressure Sensor Circuit Range/Performance.” A clogged PCV system might cause crankcase pressure to build up, which could lead to gasket failure and oil leaks.9 Dec 2021
How do you test a crankcase pressure sensor?
https://www.youtube.com/watch?v=cKPPE7QPPeE
Where is the crankcase pressure sensor?
Because crankcase pressure sensor is usually mounted right on the engine block (crankcase), harnesses and wires are exposed to the crevices with extreme temperature (i.e., the exhaust manifold). Take note of these when checking the circuits and sensors. Look for any cracked or hardened wires or moisture in the harness.
What does the crankcase pressure sensor do?
The crankcase pressure sensor tells the PCM how much pressure is building up inside the engine. The PCM needs accurate pressure sensor values to prevent seals and gaskets from getting damaged due to excessive pressure.9 Dec 2021
How much does it cost to replace crankcase pressure sensor?
The Ford Crankcase Pressure Sensor can run anywhere from around $41 on sale up to around $90 for a new part. A typical model number for this iS901-7119, and can be sourced from Your local Autozone.
How do you get rid of crankcase pressure?
This usually happens when the engine is under load or at high rpm, which is when pressure builds up quickly and needs to be relieved the most. The extreme solution to prevent all of this is to install a vacuum pump that continuously draws the pressure out of the crankcase.13 May 2014
How do you reduce crankcase pressure?
The best way to minimize crankcase vapor pressure blow-by is to seal the engine as efficiently as possible from cylinder pressure. One way is to minimize ring end gaps by custom setting the end gaps on the top two rings to fit the way the engine will be run.3 Feb 2020
What causes high crankcase pressure?
Your crankcase has excessive pressure because the piston rings are worn out. The pressure is not in itself, the problem, but it is a sign or symptom of the problem. Worn rings and/or bores allow combustion gases to bypass the pistons & this is what causes your crankcase pressure.