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P1196

O2 Sensor 2/1 (Bank 2 Sensor 1) Slow During Catalyst Monitor.

  • Jeep
  • Powertrain
  • Manufacturer code
  • Low severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
1
AreaFuel and air metering
96
FaultThe specific fault in that area

What it means

On Jeep (Chrysler-group) vehicles, P1196 means the upstream oxygen sensor on Bank 2 (sensor 2/1) responded too slowly when the engine control unit tested it during the catalyst monitor. The control unit watches how quickly the sensor switches between rich and lean, and sets the code when the switching rate is below its limit. It points to a sluggish or contaminated sensor, or to a wiring or exhaust fault affecting its signal, rather than directly to a failed catalyst.

Symptoms

  • Malfunction indicator lamp on
  • Slightly higher fuel consumption
  • Rough idle or hesitation in some cases
  • Catalyst monitor not completing, causing an emissions test failure
  • Possible other oxygen sensor or fuel trim codes stored alongside

Possible causes

  • Aged or contaminated Bank 2 upstream oxygen sensor with slow responselikely
  • Damaged wiring, poor connector contact or corrosion in the sensor circuitpossible
  • Exhaust leak upstream of or near the sensor letting in false airpossible
  • Sensor contamination from oil burning, coolant leak or silicone/fuel additivespossible
  • Fuel mixture fault on Bank 2 such as a vacuum leak, weak injector or fuel pressure problempossible
  • Heater circuit or heater power supply fault slowing sensor warm-uprare
  • Engine control unit fault or outdated calibration where a manufacturer bulletin appliesrare

How to diagnose

  1. Read all stored and pending codes and the freeze frame data, noting engine load, temperature and fuel trim at the time it set
  2. Confirm which side is Bank 2 for the specific engine, as layout varies by model and engine
  3. Inspect the sensor wiring and connector for chafing, heat damage, corrosion and water ingress
  4. Check for exhaust leaks around the manifold, flange joints and sensor boss
  5. Review short and long term fuel trims on both banks for signs of a lean or rich condition, and check for vacuum leaks
  6. Watch the live Bank 2 upstream sensor signal on a scan tool or graphing meter and compare its switching speed with Bank 1 at warm idle and light load
  7. Check the sensor heater resistance and supply voltage against the manufacturer's specification for that model
  8. Look for oil, coolant or fuel contamination signs on the sensor tip and check for any applicable software updates for the vehicle

How to fix

  • Replace the Bank 2 upstream oxygen sensor if its response is confirmed slow
  • Repair or replace damaged wiring and connectors in the sensor circuit
  • Repair exhaust leaks and renew faulty gaskets
  • Fix the underlying fuelling fault such as vacuum leaks, injectors or fuel pressure, and cure any oil or coolant contamination before fitting a new sensor
  • Update the engine control unit calibration only where an outdated or faulty calibration is a known cause for the vehicle

Can I keep driving?

Low severity

The car can normally be driven while you book it in, as this is mainly an emissions and efficiency concern. Have it checked soon, especially if the car runs roughly or other fuelling codes appear, as a persistent fuelling fault can eventually harm the catalyst.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

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