"U" Check
When warning light illuminates to indicate a fault, light flashes the trouble code which corresponds to faulty part. When "Check Engine" light remains off to indicate no fault, light is monitoring oxygen sensor output (rich-on, lean-off).
When warning light illuminates to indicate a fault, light flashes the trouble code which corresponds to faulty part. When "Check Engine" light remains off to indicate no fault, light is monitoring oxygen sensor output (rich-on, lean-off).