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Home >> Dodge and Ram >> 1999 >> Durango 5.9 Z, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Self-Diagnostic Tests >> DTC P0133: 1/1 O2S Slow Response
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DTC P0133: 1/1 O2S Slow Response

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For circuit identification and wiring diagram, see DURANGO wiring diagram in WIRING DIAGRAMS article.
NOTE: DTC P0133: 1/1 O2S SLOW RESPONSE is monitored with engine coolant temperature more than 147°F (63.9°C), after reaching a vehicle speed of 10 MPH, and throttle remains open (off idle) for 2 minutes and subsequently bringing vehicle to a stop and allowing engine to idle in Drive (A/T) or Neutral (M/T). DTC may be stored in Powertrain Control Module (PCM) when PCM senses that 1/1 Heated Oxygen Sensor (HO2S) voltage is switching from less than .27 volt to more than .62 volt and back less times than required. Possible causes are: engine mechanical problem, exhaust leak, defective 1/1 HO2S, defective connectors or defective wiring.
NOTE: 1/1 HO2S is located in upstream position.
  1. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 5). If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to next step.
  2. Turn ignition on, with engine off. Using a voltmeter, backprobe sensor ground circuit (Black/Light Blue wire) between PCM and 1/1 HO2S. Wiggle sensor ground circuit while monitoring voltage. If voltage drops to less than .1 Volt Direct Current (VDC) while wiggling sensor ground circuit, go to next step. If voltage does not drop to less than .1 VDC while wiggling sensor ground circuit, repair poor connection (high resistance) in sensor ground circuit. Perform TEST VER-5A3.
  3. Ensure ignition is on, with engine off. Using voltmeter, backprobe 1/1 HO2S signal circuit (Tan/White wire) between PCM and 1/1 HO2S. Wiggle signal circuit while monitoring voltage. If voltage drops to less than .1 VDC while wiggling signal circuit, go to next step. If voltage does not drop to less than .1 VDC while wiggling signal circuit, repair poor connection (high resistance) in 1/1 HO2S signal circuit. Perform TEST VER-5A3.
  4. At this time, DTC P0133: 1/1 O2S SLOW RESPONSE does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0133: 1/1 O2S SLOW RESPONSE returns, go to next step. If DTC P0133: 1/1 O2S SLOW RESPONSE does not return, see INACTIVE DTC CONDITION. Test is complete.
  5. Start engine and allow it to idle. Check exhaust system for excessive smoke caused by coolant or oil consumption. Repair engine mechanical problem as necessary and replace 1/1 HO2S. Perform TEST VER-5A3. If engine mechanical condition is okay, go to next step.
  6. Ensure engine is still idling. Check exhaust system for leaks between engine and catalytic converter. Repair exhaust system as necessary. Perform TEST VER-5A3. If exhaust system is okay, go to next step.
  7. Turn engine off. Turn ignition on, with engine off. Using a voltmeter, backprobe 1/1 HO2S signal circuit (Tan/White wire) between PCM and 1/1 HO2S. Wiggle signal circuit while monitoring voltage. If voltage drops to less than .1 Volt Direct Current (VDC) while wiggling signal circuit, go to next step. If voltage does not drop to less than .1 VDC while wiggling signal circuit, repair poor connection (high resistance) in signal circuit. Perform TEST VER-5A3.
  8. Ensure ignition is on, with engine off. Using voltmeter, backprobe sensor ground circuit (Black/Light Blue wire) between PCM and 1/1 HO2S. Wiggle sensor ground circuit while monitoring voltage. If voltage drops to less than .1 VDC while wiggling sensor ground circuit, replace 1/1 HO2S. Perform TEST VER-5A3. If voltage does not drop to less than .1 VDC while wiggling sensor ground circuit, repair poor connection (high resistance) in sensor ground circuit. Perform TEST VER-5A3.
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