P120D and P00BD CEL

[m5Anthony]

Randomly got a P120D code and P00BD check engine light has anyone had these codes before ? What can be the fix to this?

[M5Rick]

P120D code means Crankcase vent hose(s) could be damaged or disconnected, PCV valves could be full of oil, remove and check.
The other one points to the MAF sensors or its circuit that the inlet air flow to engine is not right, buy CRC MAF cleaner first and follow instructions to clean both of them.

[m5Anthony]

Originally Posted by M5Rick

P120D code means Crankcase vent hose(s) could be damaged or disconnected, PCV valves could be full of oil, remove and check.
The other one points to the MAF sensors or its circuit that the inlet air flow to engine is not right, buy CRC MAF cleaner first and follow instructions to clean both of them.

Currently cleaning my maf sensors and i noticed one of them was very oily and some oil dripped on the napkin lets see if this fixes the problem will report back

[m5Anthony]

Here are the maf sensors that i just took out, the passenger side one had some oil build up in it

[m5Anthony]

Reporting back after putting back the maf cleaned and code looks like it went away. I took it for a long drive and kept on turning off the car and turning it on and the code did not come back lets see what happens

[KurtsM5]

You need new PCV hoses.

[m5Anthony]

Originally Posted by KurtsM5

You need new PCV hoses.

Why do you think i need pcv hoses after the code went away when i cleaned the maf sensor?

[m5Anthony]

Originally Posted by KurtsM5

You need new PCV hoses.

Reporting back and the code is completely gone and check engine light went away , It was the mas sensors that were dirty

[M5Rick]

As you had a P120D code also its worth removing and checking the pcv valves if they are actually oil contaminated, especially the one from the oiled up MAF side. The pcv valves can have a little oil in them but if excessive will need to be changed as KurtsM5 suggests.
The clips holding the pcv valves on are very thin and easily breakable.

[KurtsM5]

Originally Posted by m5Anthony

Why do you think i need pcv hoses after the code went away when i cleaned the maf sensor?

Where did the oil come from?

[m5Anthony]

Originally Posted by M5Rick

As you had a P120D code also its worth removing and checking the pcv valves if they are actually oil contaminated, especially the one from the oiled up MAF side. The pcv valves can have a little oil in them but if excessive will need to be changed as KurtsM5 suggests.
The clips holding the pcv valves on are very thin and easily breakable.

Is this considered excessive oil on the pcv valves ?

[M5Rick]

Originally Posted by m5Anthony

Is this considered excessive oil on the pcv valves ?

I would say a definite yes, it would appear the oil under pressure is bursting through the pcv seals so a blockage probably means a new PCV valve with the hose there.

[m5Anthony]

Originally Posted by M5Rick

I would say a definite yes, it would appear the oil under pressure is bursting through the pcv seals so a blockage probably means a new PCV valve with the hose there.

I appreciate your input will definitely change these out just for preventative maintenance