You may be able to self test for active fault codes by following this procedure;
With the ignition off, hold down the trip meter button, whilst the button is still pressed down, insert the key and move it to the second position, and then it should read ''TEST'' on the display. Release the trip meter button, and then press it repeatedly until DTC shows. At this stage hopefully, you will see any active error codes, should be 4-digit codes from, what little I know.
To return to normal operation, just turn off the ignition.
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