P0421 on the 1996 Ford Probe
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| 983151 | 1999-09-22. Service bulletin. SOME VEHICLES WITH A P0421 CODE STORED IN THE POWERTRAIN CONTROL MODULE (PCM) MAY NOT BE ABLE TO IDENTIFY THE CALIBRATION WHEN REPROGRAMMING. *AK |
|---|---|
| BC3220970212 | 1997-07-17. Service bulletin. MIL CODE - P0421 - DO NOT ATTEMPT REPAIRS. *TW |
| BC1026997020 | 1997-06-27. Service bulletin. 2.0L WITH THE MIL ON AND CODE P0421. *JD |
3 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.