P1421
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Manufacturer Specific Definitions for P1421
| Make | Fault Location |
|---|---|
| Audi | Secondary air injection (AIR) valve/solenoid - short to ground |
| Bmw | Engine position system B, bank 1 – performance |
| Buick | Intake Air Low Pressure Switch Circuit High Voltage |
| Cadillac | Intake Air Low Pressure Switch Circuit High Voltage |
| Chevrolet | Intake Air Low Pressure Switch Circuit High Voltage |
| Citroen | Catalyst Damage |
| Ford | Catalyst Damage |
| Gm | Intake Air Low Pressure Switch Circuit High Voltage |
| Infiniti | Cold start emission control – malfunction |
| Lexus | Evaporative emission (EVAP) system – large leak |
| Lincoln | Catalyst Damage |
| Mercury | Catalyst Damage |
| Mitsubishi | Clogged Or Dirty Catalyst |
| Nissan | Cold start emission control – malfunction |
| Peugeot | Catalyst Damage |
| Saab | Exhaust gas recirculation (EGR) system -voltage high |
| Subaru | Exhaust gas recirculation (EGR) system – voltage high |
| Suzuki | Evaporative emission (EVAP) canister purge valve – mechanical fault |
| Toyota | EVAP Canister Gross Leak |
| Volkswagen | Secondary air injection (AIR) valve/ solenoid - short to ground |
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