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C1236 on the 2003 Mercury Mountaineer

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.

This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.

Bulletins for this model year that name C1236
032632004-07-26. Service bulletin. ANTI-LOCK BRAKE SYSTEM (ABS) LAMP ILLUMINATED AND DIAGNOSTIC TROUBLE CODE (DTC) C1235, C1236, C1237 ON VEHICLES WITH DIFFERENTIAL-MOUNTED RAR WHEEL SPEED SENSOR. *TT
172152003-11-18. Service bulletin. THE AMBER ANTI-LOCK BRAKE SYSTEM (ABS) WARNING LIGHT ON WITH DIAGNOSTIC TROUBLE CODES C1235, C1236/C1237 STORED IN MEMORY. *TT
169182003-09-09. Service bulletin. ANTI-LOCK BRAKE SYSTEM (ABS) INDICATOR LAMP ON WITH CODES C1235 AND C1236 OR C1237. *TT

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.