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P0421 | Mazda 6 Forums

P0421 | Mazda 6 Forums

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P0421 code: warm up catalyst efficiency below threshold (bank 1)

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Got Engine code p0421 (catalyst efficiency below threshold bank 1

P0421 — Warm Up Catalyst Efficiency Below Threshold (Bank 1) – eEuroparts

P0421 — Warm Up Catalyst Efficiency Below Threshold (Bank 1) – eEuroparts

Got Engine code p0421 (catalyst efficiency below threshold bank 1

Got Engine code p0421 (catalyst efficiency below threshold bank 1

OBD code P0421, 1999 Mazda Protege — Car Forums at Edmunds.com

OBD code P0421, 1999 Mazda Protege — Car Forums at Edmunds.com

got code p0421 | Mazda 6 Forums

got code p0421 | Mazda 6 Forums

P0421 | Mazda 6 Forums

P0421 | Mazda 6 Forums

The non-fouler trick to fix P0421, for noobs, by a noob | Mazdas247

The non-fouler trick to fix P0421, for noobs, by a noob | Mazdas247

Mazda 3 purge control valve 911-701 P0455 P0421 P0422 - YouTube

Mazda 3 purge control valve 911-701 P0455 P0421 P0422 - YouTube