P20E2 — Exhaust Gas Temperature Sensor 1/2 Correlation Bank 1

Will P20E2 clear itself?

Sometimes P20E2 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 is the most common cause of P20E2?

The most common causes are: open or shorted wiring in the circuit, poor ground connection, blown fuse feeding the circuit.

How do I diagnose P20E2 myself?

Start with a scan: confirm P20E2, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the sensor and actuator circuits, and verify the suspect component against live data before buying parts.

What does OBD2 code P20E2 mean?

P20E2 — Exhaust Gas Temperature Sensor 1/2 Correlation Bank 1. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: open or shorted wiring in the circuit, poor ground connection, blown fuse feeding the circuit.

How much does it cost to fix P20E2?

Repair wiring or connectors — $80–$250; Control module repair — $300–$1,000; Replace the faulty sensor or actuator — $150–$500. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What does P20E2 mean?

Behind P20E2 is a specific failure in the sensor and actuator circuits: exhaust gas temperature sensor 1/2 correlation bank 1. The onboard computer stores it in the powertrain (engine/transmission) group after verifying the fault over repeated checks.

In this definition, “Bank 1” is the side of the engine that contains cylinder 1 and “Sensor 1” is the upstream (before 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.

This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with P20E2 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

What causes P20E2?

• blown fuse feeding the circuit
• poor ground connection
• faulty sensor or actuator of the affected circuit
• open or shorted wiring in the circuit

Common symptoms of P20E2

• 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 P20E2

1. Connect an OBD2 scanner, confirm P20E2 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
2. 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.
3. Visually inspect the wiring harness and connectors related to the exhaust gas temperature sensor 1/2 correlation bank 1 for damage, corrosion, chafing or poor contact.
4. Measure reference voltage, ground and signal continuity at the component connector.
5. Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
6. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P20E2 does not return.

How to fix P20E2

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

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

How much does it cost to fix P20E2?

Repair cost depends on which component actually failed. Typical scenarios for P20E2 (parts and labor, USD, independent shop rates):

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

Overall, fixing P20E2 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 P20E2?

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.

Related OBD2 codes

• P2000: NOx Adsorber Efficiency Below Threshold Bank 1
• P2001: NOx Adsorber Efficiency Below Threshold Bank 2
• P2002: Diesel Particulate Filter Efficiency Below Threshold Bank 1
• P2003: Diesel Particulate Filter Efficiency Below Threshold Bank 2
• P2004: Intake Manifold Runner Control Stuck Open Bank 1
• P2005: Intake Manifold Runner Control Stuck Open Bank 2