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DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P2086

P2086Exhaust Gas Temperature Sensor Circuit Range/Performance (Bank 2 Sensor 2)

P2086 indicates that the powertrain control module has detected an out-of-range or erratic signal from the exhaust gas temperature sensor located after the catalytic converter on bank 2. The computer compares the sensor's voltage or resistance to expected values for the current operating conditions and flags the circuit when the reading falls outside a calibrated window or fails a rationality check.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering and auxiliary emission controls

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Reduced engine power or limp mode in some vehicles as a protective strategy
  • Poor fuel economy or altered regeneration behavior on diesel engines
  • Intermittent rough running or hesitation under load
  • A stored freeze-frame showing abnormal exhaust temperature readings

Common causes, most likely first

  1. Faulty exhaust gas temperature sensor (bank 2 sensor 2) due to age or thermal degradation
  2. Damaged or corroded wiring harness and connector pins at the sensor or PCM
  3. Exhaust leaks upstream of the sensor causing false temperature readings
  4. Restricted or damaged catalytic converter affecting exhaust flow and temperature
  5. PCM software calibration issue or internal driver fault
  6. Aftermarket sensor with incorrect resistance curve installed previously

How to diagnose and fix it

  1. Scan all modules and record freeze-frame data to confirm the code and operating conditions
  2. Visually inspect the sensor, connector, and wiring for chafing, corrosion, or heat damage
  3. Check exhaust system for leaks or restrictions upstream of the sensor
  4. Measure sensor resistance or voltage and compare to manufacturer specifications
  5. Perform a voltage drop test on the sensor circuit while wiggling the harness
  6. Replace the exhaust gas temperature sensor with an OEM-quality part if tests indicate failure
  7. Clear codes and verify repair with a test drive under the original freeze-frame conditions

What the EGT sensor code hides

  • A P2086 often sets because of a lazy sensor that still reads plausible values at idle but drifts when exhaust temperatures rise, so a simple key-on resistance check can pass while the sensor is still faulty.
  • Exhaust leaks between the turbocharger and the sensor are a commonly missed cause because they let cool air pulse across the probe and create erratic readings that mimic a bad sensor.
  • On many diesel vehicles, this code can be triggered by a failed regeneration cycle that never completes, leaving the PCM to interpret the resulting temperature profile as out of range.
  • Technicians who replace the sensor without checking the connector for pushed-out pins or green corrosion often see the code return within a few drive cycles.
  • A restricted catalytic converter on bank 2 can cause the downstream EGT sensor to run hotter than expected and set a range/performance code even when the sensor itself is healthy.

Can I keep driving with P2086?

You can generally continue driving short distances at moderate speeds, but avoid heavy towing or sustained high-load operation until the fault is diagnosed. Prolonged driving with an out-of-range exhaust temperature signal can lead to poor regeneration behavior, increased emissions, or a derate condition on diesel vehicles.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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