OBD Guide
ENFRDEESPT

P0194

Fuel Rail Pressure Sensor Circuit Intermittent/Erratic Bank 1

P0194 is an OBD-II diagnostic trouble code meaning: Fuel Rail Pressure Sensor Circuit Intermittent/Erratic Bank 1. Common causes: damage or oxidation of the fuel pressure sensor connector, unstable contact in the sensor wiring (broken wire, bad terminal). Estimated repair cost: $44–222.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$44–222 (est.)

Symptoms

  • Check Engine light on dashboard
  • Unstable engine operation at idle, floating speed
  • Jerks and dips during acceleration
  • Possible starting difficulties, especially when the engine is hot
  • The scanner shows chaotic pressure surges in the fuel rail

Causes

  • Damage or oxidation of the fuel pressure sensor connector
  • Unstable contact in the sensor wiring (broken wire, bad terminal)
  • Internal failure of the fuel pressure sensor (unstable sensing element)
  • Fuel pressure pulsations due to faulty fuel pump
  • Fuel pump strainer is dirty

How to Fix

  1. Read codes and monitor fuel rail pressure in real time in various modes
  2. Lightly move the sensor wiring harness with the engine running - if the pressure on the scanner “jumps”, the problem is in the wiring
  3. Inspect the sensor connector for oxidation or contact damage
  4. Check the supply voltage (5V) and the sensor signal under different operating modes
  5. Carry out a load test of the fuel pump to eliminate pressure pulsations
  6. If the wiring and pump are in good condition, replace the pressure sensor in the fuel rail

Related codes

P0190P0191P0192P0193P0087P0088

Error P0194 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0194 code mean?

P0194 is an OBD-II diagnostic trouble code that indicates: Fuel Rail Pressure Sensor Circuit Intermittent/Erratic Bank 1

What causes a P0194 error code?

The most common causes of P0194 include: Damage or oxidation of the fuel pressure sensor connector; Unstable contact in the sensor wiring (broken wire, bad terminal); Internal failure of the fuel pressure sensor (unstable sensing element); Fuel pressure pulsations due to faulty fuel pump.

How do I fix a P0194 diagnostic trouble code?

To fix P0194: Read codes and monitor fuel rail pressure in real time in various modes. Lightly move the sensor wiring harness with the engine running - if the pressure on the scanner “jumps”, the problem is in the wiring. Inspect the sensor connector for oxidation or contact damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0194?

Yes, but get it checked soon

How much does it cost to fix P0194?

The estimated repair cost for P0194 is $44–222. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat