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Home / DTC / P1195 — Low resistance failure in the oxygen sensor heater circuit heated (banks 1 and 2 of sensor 2)

P1195 — Low resistance failure in the oxygen sensor heater circuit heated (banks 1 and 2 of sensor 2)

Detailed page for trouble code P1195.

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Code

P1195

LAND ROVER P — Powertrain

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

Brand: LAND ROVER
Type: P — Powertrain
AI status
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Page language: EN

Causes

  • Shorted heater element inside the oxygen sensor (sensor 2, both banks)
  • Short to power or low-resistance short between heater wires
  • Corroded or damaged connector pins causing low-resistance path
  • Incorrect replacement sensor with wrong internal heater resistance
  • PCM/ECU driver transistor fault
  • Aftermarket harness modification or repair error creating a short

Symptoms

  • Check Engine Light/MIL illuminated
  • Possible poor fuel trim control or drivability issues after long-term trouble
  • Failed emissions test
  • Possible stored or pending related O2 heater codes for sensor 2 on one or both banks

What to check

  • Confirm freeze frame and related stored codes (look for other O2 heater or sensor codes)
  • Visual inspection of downstream O2 sensor wiring, shields and connectors for damage, corrosion or melting
  • Measure heater element resistance at the sensor with sensor disconnected
  • Back-probe heater supply and control wires to verify voltage and activation by PCM
  • Check fuses/relays associated with O2 sensor heater circuits
  • Inspect for aftermarket repairs or harness splices near sensors/catalytic converters

Signal parameters

  • Typical O2 sensor heater resistance (disconnected): approx. 2–14 ohms (varies by sensor; consult OEM spec)
  • Heater supply voltage: nominal battery voltage (~11–14 V) when switched on by PCM
  • Expected current draw: a few amps when heater is energized (depends on sensor)
  • PCM monitors heater circuit resistance or current and flags low-resistance condition below manufacturer threshold

Diagnostic algorithm

  1. Retrieve freeze frame and all stored DTCs. Note whether both bank 1 and bank 2 sensor 2 codes are present or only one.
  2. Visually inspect both downstream O2 sensors, connectors and harness routing for chafing, pin corrosion, melted insulation or signs of heat damage.
  3. Disconnect sensor 2 connectors (bank 1 and bank 2) and measure heater coil resistance across the heater pins. Compare to OEM spec. Resistance significantly lower than spec indicates internal short.
  4. With connectors disconnected, check for unintended continuity from each heater pin to battery positive, to ground, and to adjacent heater circuits using an ohmmeter. Low resistance to ground or between circuits indicates wiring short.
  5. Reconnect and back-probe the heater control circuit with key ON/engine running (or using an appropriate scan tool command to enable heater). Measure supply voltage and switched driver voltage; check for correct switching and for excessive current draw / voltage drop.
  6. If wiring and connectors are good but measured sensor resistance is still low, swap the suspect downstream sensor with a known-good sensor (if available) to see if the code follows the sensor.
  7. If the problem remains after sensor swap and wiring checks, test or substitute the PCM/ECU driver circuit (consult manufacturer procedure) — check for TSBs or ECU updates related to O2 heater circuits before replacement.
  8. Repair or replace damaged wiring, connectors or sensors as required, clear codes and perform a drive cycle to confirm the fault does not return.

Likely causes

  • Internal short in one or both downstream O2 sensor heaters
  • Damaged wiring harness (chafing, insulation cut) creating a short to ground or between heater circuits
  • Corroded or contaminated sensor connector pins causing unexpected low resistance path
  • Faulty ECU/PCM heater driver (less common)

Fault status

⚠️ Status
PCM detected heater circuit resistance below acceptable threshold for downstream oxygen sensor(s) (Sensor 2 on Banks 1 and/or 2). Indicates possible shorted heater element, wiring short or control driver fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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