OBD Guide
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P03A3

Cylinder 2 Pressure Sensor Circuit Intermittent/Erratic

P03A3 is an OBD-II diagnostic trouble code meaning: Cylinder 2 Pressure Sensor Circuit Intermittent/Erratic. Common causes: poor contact in the cylinder 2 pressure sensor connector, damage to wiring insulation (fraying, bending). Estimated repair cost: $22–133.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–133 (est.)

Symptoms

  • Check Engine Light Intermittently
  • Unstable engine operation, disappearing and reappearing
  • Random misfire in cylinder 2
  • Unpredictable failures during acceleration
  • Difficulty starting in some cases

Causes

  • Poor contact in the cylinder 2 pressure sensor connector
  • Damage to wiring insulation (fraying, bending)
  • Incipient pressure sensor failure
  • Corrosion in electrical contacts
  • Weak sensor mount, causing microvibrations

How to Fix

  1. Check the connector of the cylinder 2 pressure sensor - clean the contacts, make sure they are securely fixed
  2. Visually inspect the wiring for abrasions, fractures, and signs of overheating
  3. Check the sensor signal with an oscilloscope while the engine is running
  4. Lightly move the connector with the engine running to reproduce the fault.
  5. If confirmed, replace the sensor or repair the wiring
  6. Reset codes and conduct a long test drive to confirm serviceability

Related codes

P03A5P03A8P0302P0396

Error P03A3 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P03A3 code mean?

P03A3 is an OBD-II diagnostic trouble code that indicates: Cylinder 2 Pressure Sensor Circuit Intermittent/Erratic

What causes a P03A3 error code?

The most common causes of P03A3 include: Poor contact in the cylinder 2 pressure sensor connector; Damage to wiring insulation (fraying, bending); Incipient pressure sensor failure; Corrosion in electrical contacts.

How do I fix a P03A3 diagnostic trouble code?

To fix P03A3: Check the connector of the cylinder 2 pressure sensor - clean the contacts, make sure they are securely fixed. Visually inspect the wiring for abrasions, fractures, and signs of overheating. Check the sensor signal with an oscilloscope while the engine is running. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P03A3?

Do not drive — repair immediately

How much does it cost to fix P03A3?

The estimated repair cost for P03A3 is $22–133. Actual cost depends on your vehicle, location, and labor rates.

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