OBD Guide
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P043A

Catalyst Temperature Sensor Circuit Bank 2 Sensor 2

P043A is an OBD-II diagnostic trouble code meaning: Catalyst Temperature Sensor Circuit Bank 2 Sensor 2. Common causes: faulty bank 2 catalytic converter temperature sensor, open or shorted sensor wiring. Estimated repair cost: $6–56.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$6–56 (est.)

Symptoms

  • Check Engine light is on
  • Bank 2 catalyst temperature control failure
  • Increased harmful emissions
  • In most cases, ride quality is not affected
  • Emergency neutralizer control mode possible

Causes

  • Faulty bank 2 catalytic converter temperature sensor
  • Open or shorted sensor wiring
  • Damage to wire insulation due to high temperatures
  • Oxidation or damage to the sensor connector
  • Mechanical damage to the sensor
  • ECU malfunction (rare)

How to Fix

  1. Read all error codes - pay attention to the combination with P043B
  2. Visually inspect the sensor and wiring in the catalyst area of bank 2
  3. Check the voltage and grounding in the sensor connector with the ignition on
  4. Measure the sensor resistance and compare with the norm
  5. Replace the temperature sensor if the fault is confirmed
  6. Check the integrity of the wiring harness from the sensor to the ECU
  7. Reset codes and take a test drive

Related codes

P042AP042BP043BP0430P0436P0432

Error P043A by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P043A code mean?

P043A is an OBD-II diagnostic trouble code that indicates: Catalyst Temperature Sensor Circuit Bank 2 Sensor 2

What causes a P043A error code?

The most common causes of P043A include: Faulty bank 2 catalytic converter temperature sensor; Open or shorted sensor wiring; Damage to wire insulation due to high temperatures; Oxidation or damage to the sensor connector.

How do I fix a P043A diagnostic trouble code?

To fix P043A: Read all error codes - pay attention to the combination with P043B. Visually inspect the sensor and wiring in the catalyst area of bank 2. Check the voltage and grounding in the sensor connector with the ignition on. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P043A?

Do not drive — repair immediately

How much does it cost to fix P043A?

The estimated repair cost for P043A is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat