Variable Valve Timing (VVT) Engine Smog
VVT is variable valve timing — adjusts valve operation for efficiency + power. Found on most 2000+ engines (Honda i-VTEC, Toyota VVT-i, BMW VANOS, GM AFM, etc.). Common smog issue: failed VVT solenoid or stretched timing chain causes misfire + emissions codes.
Common VVT (Variable Valve Timing) smog issues
Failed VVT solenoid, stretched timing chain, low oil pressure
How to fix
Replace VVT solenoid, replace timing chain + tensioner
Typical repair cost
$200-$1,200 depending on engine
Common questions
What is VVT (Variable Valve Timing)?
VVT is variable valve timing — adjusts valve operation for efficiency + power. Found on most 2000+ engines (Honda i-VTEC, Toyota VVT-i, BMW VANOS, GM AFM, etc.). Common smog issue: failed VVT solenoid or stretched timing chain causes misfire + emissions codes.
What causes a VVT (Variable Valve Timing) smog failure?
Failed VVT solenoid, stretched timing chain, low oil pressure
How is VVT (Variable Valve Timing) fixed?
Replace VVT solenoid, replace timing chain + tensioner
What does fixing cost?
$200-$1,200 depending on engine