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Home / DTC / P2199 — Intake air temperature 1/2 correlation

P2199 — Intake air temperature 1/2 correlation

Detailed page for trouble code P2199.

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Code

P2199

LAND ROVER P — Powertrain

Intake air temperature 1/2 correlation

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 4 EN: 13 RU: 9
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Page language: EN

Causes

  • Faulty IAT sensor (either sensor 1 or 2)
  • Damaged wiring or chafed harness between sensors and PCM
  • Corroded, loose or contaminated connector(s) at one or both sensors
  • Sensors swapped or installed in incorrect locations after service
  • Intake air leaks or modifications causing sensor reading differences
  • Poor ground or power supply to sensor circuit

Symptoms

  • MIL (check engine light) illuminated
  • Inconsistent IAT readings on live data (one sensor far from ambient/other sensor)
  • Hard start or rough idle under some conditions
  • Reduced fuel economy or poor driveability
  • Possible fuel trim abnormalities or transient fueling issues

What to check

  • Read and record freeze frame and live data for IAT1 and IAT2 with engine cold and warm
  • Compare both IAT values to ambient air temperature and each other
  • Inspect sensor connectors, wiring and grounds for damage, corrosion or looseness
  • Backprobe both sensor signal and reference/ground circuits with multimeter or scope
  • Measure sensor resistance at known ambient temperatures (engine off) and compare to specification
  • Wiggle test wiring while monitoring live data for intermittent changes

Signal parameters

  • IAT sensors are negative temperature coefficient thermistors — resistance falls as temperature rises
  • Expected signal behaviour: both IATs should track similarly and change smoothly with ambient/temp (no sudden jumps)
  • Typical voltage range on the IAT signal: ~0.3–4.7 V depending on temperature and circuit (varies by vehicle)
  • Resistance behavior: high at cold, lower at hot; sensors commonly fall in the low kiloohm range at ambient temperature (refer to Land Rover specification for exact Ohms/°C)

Diagnostic algorithm

  1. Retrieve P2199 and any related codes; record freeze-frame and live IAT1/IAT2 values (cold start and after warm-up).
  2. Visually inspect both IAT sensors, connectors and wiring for damage, corrosion, or incorrect routing. Repair any obvious issues.
  3. With ignition ON (engine OFF), backprobe each IAT signal and ground. Verify reference voltage/ground are present and stable. Compare voltages to each other and to expected ranges.
  4. Measure each sensor's resistance at ambient temperature (engine cold). Confirm resistances are within manufacturer spec or that both sensors are similar. Replace any sensor with out-of-spec resistance.
  5. Start engine and monitor live IAT1 and IAT2 while warming up. Both should rise and track closely. If one is erratic or doesn’t change, suspect that sensor or its wiring.
  6. Perform a wiggle test of the harness while monitoring live data to locate intermittent wiring faults. Check continuity to PCM if possible.
  7. If wiring and sensors check normal but correlation fault persists, inspect for intake modifications that alter sensor exposure. Temporarily swapping sensors (if identical and accessible) can help isolate sensor vs. wiring/ECU.
  8. If wiring and sensors both test good, check PCM for software updates/TSBs. Consider ECU fault if all circuits verified. Clear codes and road test after repairs.

Likely causes

  • Failed IAT sensor 1 or 2 (most common)
  • Wiring open, short to power/ground, or high resistance connector at one sensor
  • Connector contamination or corrosion causing intermittent high resistance
  • Sensor installed in different thermal location (aftermarket intake)

Fault status

⚠️ Status
Intake air temperature sensor 1/2 correlation — PCM detected inconsistent signals between IAT sensors 1 and 2 exceeding expected limits; fault stored and MIL may be set.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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