Easy step by step guide on how to retrieve and define Range Rover OBD1 diagnostic
Difficulty Scale: 2 of 10Step 1 - When a code is stored the "check engine"
light will illuminate. Most of these trouble codes are made up of two digits and
are accessible under the passenger seat.
Step 2 - Turn the ignition key to the "ON" position
the trouble codes will start to display. The first set of blinking lights will be
the "tenth" digit and the second set of blinks tell the "one" position.
Step 3 - Example, if the first blinking light flashes
off and on twice, and the second blinking light flashes once the code number is
Step 4 - To restart code gathering sequence shut
the key off and then back on again.
Step 5 - To clear trouble codes after the repairs
have been made turn the ignition key to the "on" position, disconnect the serial
link mating plug, wait ten seconds and reconnect the plug. Switch the ignition switch
to the "off" position for five seconds and turn the ignition key back on again.
Range Rover ODB1 Trouble Code Definition Table
Code 02 - Power interruption
Code 12 - Airflow meter
Code 14 - Coolant sensor
Code 17 - Throttle potentiometer
Code 18 - Throttle potentiometer input high/airflow meter low
Code 19 - Throttle potentiometer input low/airflow meter high
Code 21 - Fuel tune select
Code 23 - Fuel supply
Code 25 - Ignition misfire
Code 28 - Air leak
Code 29 - ECU memory check
Code 34 - Injector bank A
Code 36 - Injector bank B
Code 44 - Lambda (O2) sensor A - left bank
Code 45 - Lambda (O2) sensor B - right bank
Code 48 - Stepper motor
Code 40 - Misfire bank A - left bank
Code 50 - Misfire bank B - right bank
Code 58 - Group faults 23/28
Code 59 - Fuel thermistor
Code 68 - Road speed sensor
Code 69 - Gear switch
Code 88 - Purge valve leak
Written by Ken Lavacot Co-Founder and CEO of 2CarPros.com 35 years in the automotive repair field, ASE Master Technician, Advanced Electrical and Mechanical Theory.
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Article first published 2009-09-11 (Updated 2015-02-12)