2005 Nissan Xterra OBD2 Codes P0011 and P0021 After Timing Chain Replacement
I own a 2005 Nissan Xterra and recently had the timing chain replaced at a mechanic shop. Since then, my vehicle has triggered two diagnostic trouble codes: P0011 and P0021. I'm concerned whether these codes indicate that the mechanic made an error during the repair or if they are simply related to the Variable Valve Timing (VVT) system. As I understand, VVT is not a single component but a system involving cam timing, solenoids, and actuators. My vehicle now stalls intermittently and takes several attempts to start—especially after being idle for some time. I've already replaced the spark plugs as advised by the shop, but the issue persists. I'm seeking clarification on whether these codes are directly linked to improper cam timing or if further diagnostics are needed.
P0011 and P0021 relate to camshaft timing, which involves the timing chain, solenoids, and actuators—all part of the VVT system. You should not have received a vehicle with these codes after a timing chain replacement. These codes indicate improper cam positioning. The VVT system is not a single component but an integrated system. See: https://www.obd-codes.com/p0011, https://www.obd-codes.com/p0021