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Engine Controls - Tests W/codes - 2.5L Jeep Cherokee II

Step-by-step instructions on "Engine Controls - Tests W/codes - 2.5L" for Jeep Cherokee II (1984–1996). Pick an article — removal, installation, adjustment and diagnostics with illustrations.

HARD FAILURES

INTERMITTENT FAILURES

PRELIMINARY CHECKS

ECU CHECKOUT PROCEDURE

DRB-II JEEP PROBLEMS

JEEP DRB-II ADAPTER

VEHICLES TESTED

HOW TO USE

SELECT VEHICLE

STATE DISPLAYS

CLEARING CODES

SUMMARY

FAULT 1065: LEAN O2 SENSOR INPUT

FAULT 1066: RICH O2 SENSOR INPUT