P0133 OBD Trouble Code

O2 Sensor Circuit Slow Response

HO2S Slow Response Conditions

Engine runtime over 3 minutes, ECT sensor input over 170-F, VSS over 20 mph with throttle off-idle for 2 minutes, then vehicle brought to a stop with engine at idle speed in drive (A/T) or neutral (M/T), then the test started and the PCM detected that the front HO2S-11 signal switched from 390-670 mv too few times.

HO2S Circuit Slow Response Conditions

Engine running in closed loop, then the PCM detected that the HO2S amplitude and frequency were out of range (rich to lean switch was over one second)

HO2S Slow Response Conditions

No AIR, ECT, EVAP, IAT, ln]ector, MAF, MAP, Misfire or TP sensor codes set, DTC P0155 and P1133 not set, AIR, Catalyst and EGR Flow test inactive, no injectors disabled, engine runtime over 202 seconds, system voltage 8-18v, engine speed 1200-2800 rpm in closed loop, throttle position over 3%, ECT sensor input over 167°F, MAF input from 15-35 g/sec, Transmission not in Park, Reverse or Neutral, all conditions met for 3 seconds, then the PCM detected that the HO2S-11 lean to rich average transition time or that the HO2S-11 rich to lean average transition response time was longer than 200 ms during the sample period, or that the HO2S signal was from 325-625 mv during the sample period.

Heated oxygen sensor (HO2S) 1, Bank 1 - slow response

Wiring, HO2S, fuel/intake system, injector, exhaust system, MAF sensor, ECM