Catalyst temperature low on your vehicle? It can cause emissions failure—scan P0424, test Bank 1 heater and consider repair or reprogram or replacement.

Check engine light and fuel economy loss on your vehicle? Bank 1 heated catalyst below efficiency, risking emissions failure—scan and reprogram or replace.

Check engine light on your vehicle? Catalyst 2 efficiency below threshold Bank 1 can cause emissions failure—run a module scan and arrange repair.

Low power and check engine light on your vehicle? P0421 = Catalyst 1 efficiency below threshold Bank 1 – emissions may fail. Scan, test, reprogram, repl...

Check engine light and low fuel economy on your vehicle? P0420 = Catalyst System Efficiency Below Threshold Bank 1 – repair now to avoid emissions failure.

Air system warning on your vehicle? A bad AIR System Control B Circuit can cause emissions failure. Scan, test the circuit, and have the module repaired.

Air system control A circuit fault in your vehicle lights a warning, risking emissions compliance; scan P0418, test the circuit, and arrange reprogramming.

AIR System Switching Valve B Circuit Shorted on your vehicle lights a warning and may affect emissions—scan, test the valve, and arrange repair today.

AIR System Valve B Circuit Open on your vehicle disables emissions and triggers a check‑engine light. Scan P0416, test wiring, replace or reprogram module.

Air System Switching Valve B Circuit fault triggers a limp‑air warning on your vehicle—risking emissions failure. Scan, test the valve, and repair.