986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - My new-to-me 987 appears to be broken. CEL P0021

thstone · 08-11-2013, 06:47 AM

P0021 Adjustment of Inlet Camshaft in relation to Crankshaft, Bank 2 – Signal Implausible
Possible cause of fault
- Dirt in oil circuit
- Sealing strips on inlet camshaft adjuster faulty
- Oil pressure too low
- Mechanical fault in inlet camshaft adjuster
- Magnetic hydraulic valve faulty

Since its a CPO, flatbed it to the dealer. Most likely a failed cam position sensor but could also be a few other things that are harder to diagnose and repair.

08-11-2013, 06:47 AM	#2
thstone Certified Boxster Addict Join Date: Nov 2010 Location: Los Angeles Posts: 7,669	P0021 Adjustment of Inlet Camshaft in relation to Crankshaft, Bank 2 – Signal Implausible Possible cause of fault - Dirt in oil circuit - Sealing strips on inlet camshaft adjuster faulty - Oil pressure too low - Mechanical fault in inlet camshaft adjuster - Magnetic hydraulic valve faulty Since its a CPO, flatbed it to the dealer. Most likely a failed cam position sensor but could also be a few other things that are harder to diagnose and repair. __________________ 1999 996 C2 - sold - bought back - sold for more 1997 Spec Boxster BSR #254 1979 911 SC POC Licensed DE/TT Instructor