1988 Plymouth Colt BaseFACTORY OEM SERVICE PROCEDURE

Self-Diagnostic Codes: Notes

DIAGNOSTIC CODES

Code Number Diagnostic Item
1Β  Oxygen Sensor & Computer
2Β  Engine Speed Sensor
3Β  Airflow Sensor
4Β  Pressure Sensor
5Β  Throttle Position Sensor
6Β  ISC Motor Position Sensor
7Β  Coolant Temperature Sensor
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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