P2031 — Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2

P2031 — Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector, control module driver fault.

powertrain (engine/transmission)

Is it safe to drive?

Short-term driving is OK In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P2031 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the exhaust gas temperature sensor circuit bank 1 sensor 2 for damage, corrosion, chafing or poor contact.
Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2031 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P2031 (parts and labor, USD, independent shop rates): Repair wiring or connectors: $80–$250; Replace the faulty sensor or actuator: $150–$500; Control module repair: $300–$1,000. Overall, fixing P2031 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

Is it safe to drive with P2031?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

Will P2031 clear itself?

Sometimes P2031 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What are the symptoms of P2031?

Drivers most often notice: increased fuel consumption in some cases, possible limp mode depending on the affected component, Check Engine Light on, the affected system operates intermittently or not at all.

What is the most common cause of P2031?

The most common causes are: faulty sensor or actuator of the affected circuit, corroded, loose or damaged connector, control module driver fault.

What does OBD2 code P2031 mean?

What does P2031 mean?

The engine control module sets P2031 when it detects a fault in the sensor and actuator circuits. In practical terms: exhaust gas temperature sensor circuit bank 1 sensor 2. The code belongs to the powertrain (engine/transmission) group of OBD2 codes.

In this definition, “Bank 1” is the side of the engine that contains cylinder 1 and “Sensor 2” is the downstream (after the catalytic converter) sensor. Mixing up banks and sensor positions is the most common DIY mistake with this code — verify the physical location before replacing anything.

The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores P2031 and switches on the warning light. Freeze frame data saved with the code shows the exact conditions — rpm, load, temperature, speed — at the moment the fault was detected, which is the best starting point for diagnosis.

What causes P2031?

poor ground connection
open or shorted wiring in the circuit
control module driver fault
corroded, loose or damaged connector
faulty sensor or actuator of the affected circuit
blown fuse feeding the circuit

Common symptoms of P2031

increased fuel consumption in some cases
possible limp mode depending on the affected component
Check Engine Light on
the affected system operates intermittently or not at all

How to diagnose P2031

Connect an OBD2 scanner, confirm P2031 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Visually inspect the wiring harness and connectors related to the exhaust gas temperature sensor circuit bank 1 sensor 2 for damage, corrosion, chafing or poor contact.
Measure reference voltage, ground and signal continuity at the component connector.
Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2031 does not return.

How to fix P2031

Start with the cheapest and most common causes before replacing expensive parts:

Repair wiring or connectors — $80–$250
Replace the faulty sensor or actuator — $150–$500
Control module repair — $300–$1,000

How much does it cost to fix P2031?

Repair cost depends on which component actually failed. Typical scenarios for P2031 (parts and labor, USD, independent shop rates):

Repair wiring or connectors: $80–$250
Replace the faulty sensor or actuator: $150–$500
Control module repair: $300–$1,000

Overall, fixing P2031 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P2031?