✅ Fixed
Knock sensor replacement: The sensor detects engine knock (detonation) and signals ECU to retard timing. When sensor fails: 1) ECU assumes worst case and retards timing aggressively. 2) Result: sluggish performance and slightly worse fuel economy. 3) Code
Knock sensor replacement: The sensor detects engine knock (detonation) and signals ECU to retard timing. When sensor fails: 1) ECU assumes worst case and retards timing aggressively. 2) Result: sluggish performance and slightly worse fuel economy. 3) Code P0325 or P0330. Fix: 1) Clean connector thoroughly — corrosion is most common cause. 2) Check wiring harness routing — if touching hot components, insulation damage. 3) Replace sensor if cleaning fails. On some engines (Toyota 1MZ-FE V6): knock sensors under intake manifold — major disassembly required ($400-600 labor).