Dtc P0139: Secondary Ho2S (Sensor 2) Slow Response - Honda S2000 Service Manual

PGM-Fl System
DTC Troubleshooting (cont'd)
DTG P0139: Secondary HO2S (Sensor 2) Slow
Resoonse
1 . R e s e t t h e E C M { s e e p a g e 1 1 - 4 1 .
2. Stan the engine. Hold the engine at 3,000 rpm with
no load (in neutral) until the radiator fan comes on.
3. Check the secondary HO2S (Sensor 2) oulput
voltage at 3,000 rpm with the scan tool.
Does the voltage stay within 0.3- 0.6 V for 2
minutes?
YES Replace the secondary HO2S (Sensor 2).1
NO Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the secondarv HO2S (Sensor 2) and at the EClvl.!
1 1 - 6 0