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The scan tool indicates Diagnostic Trouble Code (DTC) P0139: A slow response problem in the Seconoarv
Heated Oxygen Sensor (H02S) (Sensor 2) circuit.
The MIL has boen reDorted on.
DTC P0139 b sto.od.
P.oblem ve tication:
1. Do the ECM Reset Procedure.
2 . S t a r t t h e e n g i n e . H o t d t h e
engine at 3,000 rpm with no
load (in Park or neutral) until
the radiator fan comes on,
3 . C h e c k t h e S e c o n d a r y H O 2 S
{Sensor 2) output ar 3,000 rpm
th the scan tool.
Intarmittert lailurg, systsm i! OK
at thi! time. Chsck for Door con-
nections o. loose wi.es at C451
Secondary HO2S lsonsor 2) .nd
ECM.
Does the voltage stay within
0.3 - 0.6 V tortwo minutos?
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Troubleshooting
