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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 P1195: Slow 1/1 O2S During Catalyst Monitor
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DTC P1195: Slow 1/1 O2S During Catalyst Monitor

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For circuit identification and wiring diagram, see DURANGO wiring diagram in WIRING DIAGRAMS article.
NOTE: DTC P1195: SLOW 1/1 O2S DURING CATALYST MONITOR is monitored with engine running, engine coolant temperature more than 170°F (76.7°C), open throttle, vehicle speed is steadily increased more than 18 MPH but less than 55 MPH, and light engine load exists for at least 5 minutes. DTC may be stored in Powertrain Control Module (PCM) if PCM senses 1/1 Heated Oxygen Sensor (HO2S) is switching from less than .39 volt to more than .6 volt fewer times than required. Possible causes are: oil or coolant consumption, defective 1/1 HO2S, defective connector or defective wiring.
NOTE: 1/1 HO2S is located in upstream position.
  1. Start engine and allow it to idle. Check exhaust system for excessive smoke caused by oil or coolant consumption. Repair engine mechanical condition as necessary and replace 1/1 HO2S. Perform TEST VER-5A. If engine mechanical condition is okay, go to next step.
  2. Ensure engine is still idling. Check exhaust system for leaks between engine and catalytic converter. Repair exhaust system as necessary. Perform TEST VER-5A. If exhaust system is okay, go to next step.
  3. Turn ignition off. Disconnect 1/1 HO2S connector. Visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector as necessary. Perform TEST VER-5A. If connector is okay, go to next step.
  4. Turn ignition off. Ensure 1/1 HO2S connector is still disconnected. Using an ohmmeter, check resistance between ground and 1/1 HO2S connector, sensor ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open sensor ground circuit. Perform TEST VER-5A.
  5. Ensure ignition is off. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors as necessary. Perform TEST VER-5A. If connectors are okay, go to next step.
  6. At this time, 1/1 HO2S is assumed to be defective. Replace 1/1 HO2S. Perform TEST VER-5A.
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