Land Rover OBD-II Trouble Codes
-------------------------------------------------The diagnostic trouble codes (DTCs) P2030 through P2036 all relate to issues with the Exhaust Gas Temperature (EGT) sensor circuit on Bank A or Bank B, specifically Sensor 2. Sensor 2 is typically the downstream sensor located after the catalytic converter. Here's a breakdown of each code:
Exhaust Gas Temp Sensor Performance,
EGT Sensor Circuit Low Bank 1,
EGT Sensor Circuit High Bank 2,
Aftertreatment Temperature Fault,
PCM Exhaust Monitor Error,
Diagnostic Overview
The System: The Exhaust Gas Temperature (EGT) sensors monitor the heat of the exhaust at various points. This data is critical for the PCM to manage fuel injection, protect the turbocharger, and oversee the "regeneration" (cleaning) of the Diesel Particulate Filter (DPF).
P2031 – P2033 (Bank 1, Sensor 2): Refers to the sensor located after the first catalyst or DPF on the passenger side (or single exhaust) of the engine.
P2034 – P2036 (Bank 2, Sensor 2): Refers to the sensor on the driver’s side of a "V" configuration engine.
Circuit Low (P2032/P2035): Usually indicates a short to ground or a sensor that has failed internally.
Circuit High (P2033/P2036): Usually indicates an open circuit (broken wire or unplugged sensor).
Common Failure Points
The Sensor Element: EGT sensors are "Thermistors" that live in a brutal environment. Constant heat cycling (up to 800°C) eventually causes the internal ceramic or wire element to crack.
Wiring Melt: Because these sensors are threaded directly into the hot exhaust pipe, the protective sleeve on the wiring can melt if it comes unclipped, causing the wires to short against the exhaust.
Corrosion: Since they are located under the vehicle, road salt often eats away at the electrical connector pins, leading to "Circuit High" (Open) codes.
Active Regeneration Issues: If the engine is stuck in a "constant regen" state due to a clogged DPF, the excessive heat can literally cook the EGT sensor until it fails.
Troubleshooting Steps
Visual Inspection: Look for "blued" or heat-damaged wiring. Check the sensor body for cracks or heavy soot accumulation.
Resistance Test: Unplug the sensor and use a multimeter to check the resistance across the two pins.
The "Heat" Test: While watching the sensor data on a scan tool, use a heat gun (or start the engine) to warm the sensor. The temperature reading should rise smoothly. If it "jumps" or stays at a fixed value (like $-40$°C or $1000$°C), the sensor or PCM logic is faulty.
Voltage Check: Check for a 5V reference from the PCM at the harness connector with the sensor unplugged.
Would you like me to find the specific resistance specifications for your vehicle's EGT sensors?
How to Test and Replace an EGT Sensor
This video demonstrates how to locate EGT Sensor 2 and use a multimeter to determine if the sensor has failed internally or if the issue lies in the vehicle's wiring harness.
1. **P2030 - Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2 Low:**
- Indicates a low voltage condition in the EGT sensor circuit for Bank 1 Sensor 2.
2. **P2031 - Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2 High:**
- Indicates a high voltage condition in the EGT sensor circuit for Bank 1 Sensor 2.
3. **P2032 - Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 2:**
- Similar to P2030, but for Bank 2 Sensor 2.
4. **P2033 - Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 2:**
- Similar to P2031, but for Bank 2 Sensor 2.
5. **P2034 - Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2 Range/Performance:**
- Suggests a range or performance issue in the EGT sensor circuit for Bank 1 Sensor 2.
6. **P2035 - Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2 Heater Circuit Malfunction:**
- Indicates a malfunction in the heater circuit of the EGT sensor for Bank 1 Sensor 2.
7. **P2036 - Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 2 Range/Performance:**
- Similar to P2034, but for Bank 2 Sensor 2.
### Possible Causes:
1. **Faulty Exhaust Gas Temperature Sensor (Bank 1 or Bank 2, Sensor 2):** Issues with the EGT sensor itself, such as sensor degradation or failure.
2. **Wiring Issues:** Problems with the wiring or connectors associated with the EGT sensor circuit.
3. **Heater Circuit Malfunction:** If applicable, issues with the heater circuit within the EGT sensor.
4. **Exhaust Leaks:** Leaks in the exhaust system could impact sensor readings.
5. **Faulty Catalytic Converter:** A malfunctioning catalytic converter may affect EGT sensor readings.
6. **Sensor Placement:** Incorrect sensor placement or installation.
### Diagnostic Steps:
1. **Inspect EGT Sensor:** Check the EGT sensor for signs of damage or wear. If it appears faulty, consider replacement.
2. **Check Wiring and Connectors:** Inspect the wiring and connectors associated with the EGT sensor circuit. Look for any signs of damage, corrosion, or loose connections.
3. **Test Sensor Operation:** Use a multimeter or diagnostic tool to test the operation of the EGT sensor. Check for proper resistance or voltage readings.
4. **Verify Heater Circuit:** If applicable, check the heater circuit within the EGT sensor for proper operation.
5. **Inspect Exhaust System:** Check for exhaust leaks and ensure the integrity of the catalytic converter.
6. **Perform Continuity Tests:** Check for continuity in the wiring from the sensor to the Engine Control Module (ECM).
7. **Clear Codes:** After addressing any identified issues, clear the trouble codes and monitor the system for recurrence.
8. **Consider Professional Assistance:** If you are unsure about diagnosing or addressing these issues yourself, or if the faults persist, it's advisable to consult with a qualified mechanic or technician.
Addressing the root cause of the EGT sensor circuit faults is essential for proper emission control and engine performance. If in doubt or if the faults persist, seeking professional assistance is recommended for a thorough diagnosis and effective repair.
