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Home / DTC / P1196 — Low resistance failure in the oxygen sensor heater circuit heated 2 (banks 1 and 2 of sensor 2) G

P1196 — Low resistance failure in the oxygen sensor heater circuit heated 2 (banks 1 and 2 of sensor 2) G

Detailed page for trouble code P1196.

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Code

P1196

LAND ROVER P — Powertrain

Low resistance failure in the oxygen sensor heater circuit heated 2 (banks 1 and 2 of sensor 2) G

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 13 EN: 19 RU: 16
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Page language: EN

Causes

  • Shorted heater element inside the O2 sensor (internal short)
  • Short to ground in the heater wiring harness
  • Corroded/damaged connector or terminals causing low resistance path
  • Aftermarket or incorrect sensor with wrong heater characteristics
  • ECM/PCM internal driver fault (less common)
  • Incorrect repairs or wiring modifications near the exhaust or sensor location

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated (check engine light)
  • Failed emissions test or readiness monitors disabled
  • Possible increased fuel consumption or minor drivability issues if closed-loop operation affected
  • Reduced or incorrect O2 sensor heater operation (slow warm-up)

What to check

  • Read and record freeze-frame and related codes with a scan tool; confirm P1196 is current or pending
  • Visual inspection of sensor 2 connectors, wiring looms, and exhaust area for chafing, melted insulation, corrosion or heat damage
  • Check related fuses and relays for the heater circuit (if applicable)
  • Backprobe sensor heater pins with connector disconnected and measure resistance across heater pins with a multimeter
  • Measure resistance from heater supply wire to chassis ground to check for a short
  • With key ON (engine off) measure voltage at the heater supply terminal to confirm the ECM is providing battery voltage when requested by the scan tool

Signal parameters

  • Expected heater resistance (typical, vehicle-dependent): roughly 2–20 Ω. A measurement near 0 Ω indicates a low-resistance/short condition; very high or open indicates an open circuit.
  • Supply voltage to heater: ≈11–14 V with key ON when heater commanded on (check with scan tool)
  • Heater current/duty: when commanded the heater may draw several amps depending on design; abnormally high current indicates low resistance short

Diagnostic algorithm

  1. Verify code with a capable scan tool and note freeze frame and related codes (confirm P1196 pertains to bank1/2 sensor 2).
  2. Perform visual inspection of sensor, connector, and harness near exhaust and underbody for damage, corrosion or contact with ground. Repair obvious damage.
  3. Disconnect the O2 sensor connector. Measure resistance directly across the heater pins at the sensor connector. Compare to the expected range (see service data). If resistance is very low (
  4. If heater resistance at the sensor is normal, measure resistance between the heater supply wire and chassis ground to locate a wiring short. Repair any short (replace wiring, insulate, or repair connector).
  5. With the connector reinstalled, backprobe the heater supply and control wires. With key ON and heater commanded on (use scan tool), confirm supply voltage is present and control driver behavior is normal. If the ECM is driving the heater but voltage is low and wiring resistance is low, locate and repair short to ground.
  6. If wiring and sensor check out but abnormal readings persist, suspect ECM/PCM driver fault. Confirm with manufacturer diagnostics before replacing ECM.
  7. After repairs replace the sensor or repair wiring as required, clear codes and road test to confirm the fault does not recur and monitors complete.

Likely causes

  • Shorted heater element in downstream (sensor 2) O2 sensor
  • Damaged wiring harness or chafed insulation creating a short to ground at or near the sensor connector
  • Corroded or bridged connector terminals causing low resistance

Fault status

⚠️ Status
P1196 — Low resistance failure in oxygen sensor heater circuit (heated 2, banks 1 and 2, sensor 2). MIL ON. Investigate heater element, wiring, and connector for short to ground or internal sensor short.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5–2.0 hours

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160

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