OBD Guide
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P03DB

Cylinder 8 Pressure Sensor Circuit

P03DB is an OBD-II diagnostic trouble code meaning: Cylinder 8 Pressure Sensor Circuit. Common causes: damage to the wiring or connector of the cylinder 8 sensor (thermal, mechanical), internal pressure sensor failure. Estimated repair cost: $33–200.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$33–200 (est.)

Symptoms

  • Check Engine light on
  • Lack of data for cylinder 8 when diagnosing with a scanner
  • Slight engine vibration in certain modes
  • Slight reduction in power
  • Possible deterioration in fuel consumption

Causes

  • Damage to the wiring or connector of the cylinder 8 sensor (thermal, mechanical)
  • Internal pressure sensor failure
  • Open or short circuit in the rear engine wiring harness
  • Corrosion of connector contacts
  • ECU malfunction (extremely rare)

How to Fix

  1. Check the cylinder 8 sensor connector - it is usually difficult to access, you may need to remove components to gain access
  2. Inspect the wiring harness at the rear of the engine for signs of overheating or damage from hot exhaust parts.
  3. Perform electrical tests on the circuit (power, ground, signal)
  4. Make sure there are no codes for cylinder 7 - if both are present, there is likely general damage to the harness.
  5. Replace the sensor or restore the damaged wiring section
  6. Reset codes and take a test drive

Related codes

P03D1P03DFP0308P03D3P03D4

Error P03DB by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P03DB code mean?

P03DB is an OBD-II diagnostic trouble code that indicates: Cylinder 8 Pressure Sensor Circuit

What causes a P03DB error code?

The most common causes of P03DB include: Damage to the wiring or connector of the cylinder 8 sensor (thermal, mechanical); Internal pressure sensor failure; Open or short circuit in the rear engine wiring harness; Corrosion of connector contacts.

How do I fix a P03DB diagnostic trouble code?

To fix P03DB: Check the cylinder 8 sensor connector - it is usually difficult to access, you may need to remove components to gain access. Inspect the wiring harness at the rear of the engine for signs of overheating or damage from hot exhaust parts.. Perform electrical tests on the circuit (power, ground, signal). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P03DB?

Do not drive — repair immediately

How much does it cost to fix P03DB?

The estimated repair cost for P03DB is $33–200. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat