P0121 on the 2000 Saturn LS
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.
| 030604043 | 2003-10-24. Service bulletin. MALFUNCTION INDICATOR LAMP (MIL) SERVICE ENGINE SOON TELLTALE LAMP ON, REDUCED POWER LAMP MAY ILLUMINATE WITH DIAGNOSTIC TROUBLE CODES P0121, P0221, AND/OR P2135. *TT |
|---|
1 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.