Mercer OBD Trouble Code 51

AC signal on; DL contact off (in transmission shifter with diagnostic connector jumped)

Oxygen sensor lean

System lean L-Idle Adap at rich limit or lean R-Idle Adap at rich limit
O2 sensor signal indicates lean air/fuel ratio during engine operation. The computer ran the mixture to the rich limit of p

Injector circuit

Switch condition signal fault (for ES300; GS300 SC300 models)