Exhaust Gas Temperature Sensor Circuit Intermittent Bank 2 Sensor 1

What You Might Notice

• Check engine light illuminated
• Possible rough idle or hesitation under acceleration
• Reduced fuel economy
• Engine may run in limp mode if sensor signal is completely lost
• Intermittent performance issues that come and go

Most Common Causes

1. 1

   Loose or corroded connectors

   Loose connector pins, corrosion on terminals, or poor electrical contact at the EGT sensor connector is the most common cause of intermittent circuit faults.

2. 2

   Damaged wiring or insulation

   Broken wires, damaged insulation, or wires grounding out to the engine block or chassis create intermittent signal loss as the vehicle vibrates and flexes.

3. 3

   Failed EGT sensor

   The exhaust gas temperature sensor itself may be failing internally, producing inconsistent voltage signals as it deteriorates.

4. 4

   Engine control module failure

   Though rare, a faulty PCM or ECU may misinterpret valid sensor signals or have an internal circuit problem related to the EGT input.

How to Diagnose It

1. 1

   Check Loose or corroded connectors — Loose connector pins, corrosion on terminals, or poor electrical contact at the EGT sensor connector is the most common cause of intermittent circuit faults.

2. 2

   Check Damaged wiring or insulation — Broken wires, damaged insulation, or wires grounding out to the engine block or chassis create intermittent signal loss as the vehicle vibrates and flexes.

3. 3

   Check Failed EGT sensor — The exhaust gas temperature sensor itself may be failing internally, producing inconsistent voltage signals as it deteriorates.

4. 4

   Check Engine control module failure — Though rare, a faulty PCM or ECU may misinterpret valid sensor signals or have an internal circuit problem related to the EGT input.

How to Fix It

1. 1

   Inspect and clean EGT sensor connector

   Locate the EGT sensor connector on Bank 2, Sensor 1, disconnect it, and inspect for corrosion, loose pins, or debris. Clean the connector with electrical contact cleaner and reconnect firmly.

2. 2

   Check wiring harness for damage

   Trace the EGT sensor wiring from the connector to the engine control module, looking for cuts, abrasions, pinched wires, or areas where insulation is compromised. Repair or rewrap damaged sections.

3. 3

   Replace EGT sensor

   If connector and wiring are clean and intact, remove the old sensor from the exhaust manifold and install a new EGT temperature sensor in its place. Ensure proper torque and seal.

   Exhaust Gas Temperature EGT Sensor Bank 2 Sensor 1↗
4. 4

   Test or replace engine control module

   If all sensors and wiring test normal, have the PCM/ECM professionally tested or replaced as a last resort, as module failure is uncommon.

   Engine Control Module PCM ECM↗