Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 2

What You Might Notice

• Check Engine Light illuminated
• No immediately noticeable drivability issues
• Potential rough idle or performance hesitation
• Reduced fuel economy
• Possible emission test failure

Most Common Causes

1. 1

   Loose or corroded connector

   The EGT sensor connector may have oxidation, loose pins, or poor contact causing a low voltage signal. This is the most common cause and should be inspected first.

2. 2

   Broken or damaged wiring

   Wires leading to the EGT sensor may be cut, pinched, or have missing insulation creating a short to ground, resulting in a voltage drop.

3. 3

   Failed EGT sensor

   The sensor itself may have failed internally or become contaminated with carbon buildup, preventing proper voltage output.

4. 4

   Engine control module failure

   Though uncommon, a faulty PCM or ECU may fail to properly read the sensor signal, though this is rarely the root cause.

How to Diagnose It

1. 1

   Check Loose or corroded connector — The EGT sensor connector may have oxidation, loose pins, or poor contact causing a low voltage signal. This is the most common cause and should be inspected first.

2. 2

   Check Broken or damaged wiring — Wires leading to the EGT sensor may be cut, pinched, or have missing insulation creating a short to ground, resulting in a voltage drop.

3. 3

   Check Failed EGT sensor — The sensor itself may have failed internally or become contaminated with carbon buildup, preventing proper voltage output.

4. 4

   Check Engine control module failure — Though uncommon, a faulty PCM or ECU may fail to properly read the sensor signal, though this is rarely the root cause.

How to Fix It

1. 1

   Inspect and clean connector

   Locate the EGT sensor connector on Bank 1, Sensor 2 (post-catalytic converter). Clean any corrosion from the terminals using electrical contact cleaner and ensure the connector is seated fully. Wiggle test to confirm solid connection.

2. 2

   Check wiring harness

   Visually inspect the wiring from the connector to the PCM for cuts, abrasions, or damaged insulation. Look for pinch points near heat sources or moving engine components. Repair or replace damaged sections.

   Electrical Wiring Harness↗
3. 3

   Replace EGT sensor

   If connector and wiring are clean and intact, remove the failed sensor using an oxygen sensor socket. Install the new EGT sensor with proper torque and reconnect the wiring. Clear the code and test.

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

   Verify PCM operation

   If all repairs above are complete and the code returns, test the PCM power and ground circuits. Scan for additional codes that may point to module failure. Contact the dealer for PCM reprogramming or replacement if needed.