Lucas fault code reader codes...
Discussion
02 Live feed to ECU has been interrupted Normal if ECU has been disconnected to clear old fault codes. Code 02 will clear if ignition turned off for 30 secs then on again.
03 Stored data corrupted since last trip No useful information available. Test drive and try again.
12 Airflow meter out of range Possible air leak or wiring fault.
14 Coolant thermistor out of range Faulty sensor or wiring.
15 Fuel thermistor out of range Faulty sensor or wiring.
17 Throttle sensor out of range Sensor needs adjustment or is faulty or has wiring fault. This can cause low speed misfires
18 Throttle sensor output too high when air flow low Large air leak between throttle butterfly and A/F meter or faulty throttle sensor or A/F meter.
19 Throttle sensor output too low when airflow high Faulty A/F meter or throttle sensor.
21 Tune resistor out of range Check tune resistor resistance.
23 Low fuel pressure Blocked fuel filter or faulty pump or pressure regulator. Valid for cat cars only.
25 Misfire at full load Faulty plugs, leads, electronic ignition unit, distributor or coil, low fuel pressure or valve or head gasket leak. See 40 and 50. Valid for cat cars only.
28 Air leak Leak in A/F meter hoses, injector seals, inlet manifold gasket, plenum gasket, servo or crankcase vent hoses or Lambda sensors. Valid for cat cars only.
29 Checksum error The ECU is f****d.
34 Fuelling fault in nearside injector bank Injector or Lambda sensor wiring fault, faulty injectors, air leak at injector seals or inlet mainfold, blocked injectors. Valid for cat cars only.
36 Fuelling fault in offside injector bank As above but for cylinders 2-4-6-8 only. Valid for cat cars only.
40 Misfire on nearside bank As 25 but for cyclinders 1-3-5-7 only. Valid for cat cars only.
44 Nearside Lambda sensor out of range Faulty or lead-poisoned sensor or sensor wiring fault. Valid for cat cars only.
45 Offside Lambda sensor out of range As above. Valid for cat cars only.
48 Stepper motor fully open above 500 rpm or fully closed above 750 rpm Sticking stepper valve, incorrect base idle speed adjustment, air leak on non-cat cars, incorrect stepper motor adjustment, incorrect throttle butterfly adjustment, rough running because of fuel or ignition or mechanical faults.
50 Misfire on offside bank A 25 but for cylinders 2-4-6-8 only. Valid for cat cars only.
59 ECU unable to distinguish between faults 23 and 28 Fault occured for insufficient time for ECU to diagnose.
68 Road speed sensor output too low at medium rpm and high air flow Possible sensor or wiring fault (will also cause wrong speedo readings on electrical speedo cars). Valid for cat cars only.
88 Power-up check Not a fault. Sometimes displayed on first connecting test module.
03 Stored data corrupted since last trip No useful information available. Test drive and try again.
12 Airflow meter out of range Possible air leak or wiring fault.
14 Coolant thermistor out of range Faulty sensor or wiring.
15 Fuel thermistor out of range Faulty sensor or wiring.
17 Throttle sensor out of range Sensor needs adjustment or is faulty or has wiring fault. This can cause low speed misfires
18 Throttle sensor output too high when air flow low Large air leak between throttle butterfly and A/F meter or faulty throttle sensor or A/F meter.
19 Throttle sensor output too low when airflow high Faulty A/F meter or throttle sensor.
21 Tune resistor out of range Check tune resistor resistance.
23 Low fuel pressure Blocked fuel filter or faulty pump or pressure regulator. Valid for cat cars only.
25 Misfire at full load Faulty plugs, leads, electronic ignition unit, distributor or coil, low fuel pressure or valve or head gasket leak. See 40 and 50. Valid for cat cars only.
28 Air leak Leak in A/F meter hoses, injector seals, inlet manifold gasket, plenum gasket, servo or crankcase vent hoses or Lambda sensors. Valid for cat cars only.
29 Checksum error The ECU is f****d.
34 Fuelling fault in nearside injector bank Injector or Lambda sensor wiring fault, faulty injectors, air leak at injector seals or inlet mainfold, blocked injectors. Valid for cat cars only.
36 Fuelling fault in offside injector bank As above but for cylinders 2-4-6-8 only. Valid for cat cars only.
40 Misfire on nearside bank As 25 but for cyclinders 1-3-5-7 only. Valid for cat cars only.
44 Nearside Lambda sensor out of range Faulty or lead-poisoned sensor or sensor wiring fault. Valid for cat cars only.
45 Offside Lambda sensor out of range As above. Valid for cat cars only.
48 Stepper motor fully open above 500 rpm or fully closed above 750 rpm Sticking stepper valve, incorrect base idle speed adjustment, air leak on non-cat cars, incorrect stepper motor adjustment, incorrect throttle butterfly adjustment, rough running because of fuel or ignition or mechanical faults.
50 Misfire on offside bank A 25 but for cylinders 2-4-6-8 only. Valid for cat cars only.
59 ECU unable to distinguish between faults 23 and 28 Fault occured for insufficient time for ECU to diagnose.
68 Road speed sensor output too low at medium rpm and high air flow Possible sensor or wiring fault (will also cause wrong speedo readings on electrical speedo cars). Valid for cat cars only.
88 Power-up check Not a fault. Sometimes displayed on first connecting test module.
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