P242E — Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 1 Sensor 3

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

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm P242E is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. 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.
  3. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the exhaust gas temperature sensor circuit intermittent/erratic bank 1 sensor 3 for damage, corrosion, chafing or poor contact.
  4. Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
  5. Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
  6. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P242E does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P242E (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 P242E 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

How much does it cost to fix P242E?

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

Will P242E clear itself?

Sometimes P242E 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 P242E?

The most common causes are: control module driver fault, poor ground connection, blown fuse feeding the circuit.

What does OBD2 code P242E mean?

Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 1 Sensor 3 (P242E): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by control module driver fault, poor ground connection, blown fuse feeding the circuit.

How do I diagnose P242E myself?

Start with a scan: confirm P242E, 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 P242E mean?

Behind P242E is a specific failure in the sensor and actuator circuits: exhaust gas temperature sensor circuit intermittent/erratic bank 1 sensor 3. 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 3” 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.

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 P242E — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

What causes P242E?

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

Common symptoms of P242E

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

How to diagnose P242E

  1. Connect an OBD2 scanner, confirm P242E 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 circuit intermittent/erratic bank 1 sensor 3 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 P242E does not return.

How to fix P242E

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 P242E?

Repair cost depends on which component actually failed. Typical scenarios for P242E (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 P242E 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 P242E?

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