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

NOTE: 1/1 HO2S may also be referred to as an upstream oxygen sensor. On 2.5L and 4.0L Federal models, 1/1 HO2S is located in exhaust downpipe in front of catalytic converter. On 4.0L Calif. models, 1/1 HO2S is located in front exhaust manifold.
  1. Start engine and allow it to idle. Check exhaust system for excessive smoke caused by internal oil or coolant consumption. Repair engine mechanical condition as necessary and replace 1/1 HO2S. 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. 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. If connector is okay, go to next step.
  4. Measure resistance between ground and Brown/Yellow wire at 1/1 HO2S connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Brown/Yellow wire between ground connection and 1/1HO2S. See WIRING DIAGRAMS article.
  5. Ensure ignition is off. Disconnect PCM connectors. PCM is located in engine compartment on left front fender, near radiator support. Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors as necessary. If connectors are okay, go to next step.
  6. At this time, 1/1 HO2S is assumed to be defective. Replace 1/1 HO2S.
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