p0190 fuel pressure sensor

P0190 Code Fix: Fuel Pressure Sensor – Circuit Malfunction

In OBD2 Trouble Codes by Magnus Sellén10 Comments

p0190 fuel pressure sensor

In this article, You will find the information you need to solve the P0190 code the fastest and cheapest way. Learn the symptoms, causes and the fastest solutions to repair this code.

What does the P0190 code mean?

The P0190 code is triggered when the engine control unit is receiving a faulty signal from the fuel rail pressure sensor. It is a generic OBD2 code which means it applies to all makes and models from around the year 2000. It applies to both diesel, gas and other fuel types on the market.

The P0190 code is mainly an electric fault to the fuel pressure sensor for the most car models, but in some models, it can trigger the P0190 code if there is a faulty fuel pressure also. You should always start with checking your fuel pressure with a Manual Fuel Pressure Tester.

The engine control unit has a range of the signal of the fuel pressure sensor at given RPM/Boost pressure etc. If the signal from the fuel pressure sensor is falling outside of the calculated signal – The p0190 code will be triggered and stored.

P0190 Symptoms

The most common symptom of the P0190 code is just a check engine light ON and you will not have any other symptoms if it is a sensor problem. Because of this trouble code could both mean a sensor problem and a fuel pressure problem, you could also have other symptoms. If you have a sensor problem, the engine control unit will use the default values for the sensor and you may only experience a check engine light.

  • Check Engine Light / Service Engine soon Ligh
  • The engine will not start
  • Hard starting condition/Long cranking time
  • The engine makes sudden stops
  • Lack of Power
  • Limp home mode
  • Rough Idle
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Possible Causes

The most common cause is a failed fuel pressure sensor or faulty wirings to it, but as I mentioned before it can also be a fuel pressure problem depending on what car you have. You should always check your fuel pressure to diagnose this issue.

  • Damaged fuel pressure sensor (Most common)
  • Faulty wirings to fuel pressure sensor
  • Corrosion/bad connection in the fuel pressure sensor connector plug
  • Low fuel level
  • Bad fuel pump relay
  • Bad fuel pump
  • Faulty fuel pump wirings
  • Clogged fuel filter
  • Faulty Fuel pressure regulator
  • Faulty Vacuum hose to the fuel pressure regulator
  • Faulty engine control unit (Rare)

Possible Solutions

  • Replace fuel pressure sensor
  • Clean the connector plug to the fuel pressure sensor
  • Repair faulty wirings
  • Fill tank level
  • Check your fuel pump pressure
  • Check fuel pump
  • Replace fuel pump relay
  • Replace Fuel filter (If low fuel pressure)
  • Fix Vacuum leaks (If low fuel pressure)
  • Replace Fuel pressure regulator (If low fuel pressure)
  • Replace Engine control unit (Rare)

P0190 Troubleshooting Table

CodeDescriptionCommon CausesPossible Solutions
P0190Fuel Pressure Sensor – Circuit MalfunctionDamaged fuel pressure sensor

Faulty wirings to fuel pressure sensor

Bad connection in the fuel pressure sensor connector plug

Low fuel level

Bad fuel pump relay

Bad fuel pump

Faulty fuel pump wirings

Clogged fuel filter

Faulty Fuel pressure regulator

Faulty Vacuum hoses to the fuel pressure regulator

Faulty ECM/PCM (Rare)
Replace fuel pressure sensor

Clean the connector plug to the fuel pressure sensor

Repair faulty wirings

Fill tank level

Check your fuel pump pressure

Check fuel pump

Replace fuel pump relay

Replace Fuel filter

Fix Vacuum leaks

Replace Fuel pressure regulator

Replace Engine control unit (Rare)

How to diagnose the P0190 code

This is a guide to how a professional automotive technician would diagnose this issue. You may need some car electrician skills and the required tools. I’m sure you can get some good information from it even if you have low knowledge about car electrician. You should always connect a Car battery charger when you are doing any troubleshooting with your vehicle. Low voltage can trigger other unrelated trouble codes that will confuse your troubleshooting. Low voltage can also cause damage to your car’s electronics in the worst case. This guide may differ a bit from different car models. This guide is mainly for petrol engines because some diesel engines use very high pressure and may require special tools to check the fuel pressure

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Connect a car battery charger

Start with connecting a car battery charger to your car. Make sure that it is charging your car as it should. I would recommend a car battery charger over 4 amperes, as it may drain out your battery if you are having the ignition ON.

Connect your OBD2 scanner

Connect your OBD2 scanner to your vehicle. Verify the P0190 code. Erase the code and recycle the ignition and start the car(If possible) to see if it is coming back directly. Go into Live data and check the value of the fuel pressure sensor. If the car is not starting and you get a 0bar fuel pressure value, there is most likely a fuel pressure fault.

Locate your fuel pressure sensor

Locate the fuel pressure sensor. Once you have located it you should inspect the connector plug for any corrosion or other damages. Check the wirings if possible. You should now measure the wires with a Digital multimeter. Fuel pressure sensors differ a lot depending on the car model and you should find the right wiring diagram before doing this. But usually, there is one 5 volt power wire, one ground wire and one signal wire. You can check if you get 5 volts and ground from the engine control unit while the ignition is on. If you do not get it, check the wires.
If you find any wiring diagram for your fuel pressure sensor you can measure the resistance on the pins to see if there is a short or open circuit in the sensor.

Check the fuel pressure (Petrol)

Checking the fuel pressure is the most important task for this troubleshooting. To check the fuel pressure you have to get a Manual Fuel Pressure Tester with the right adapters to fit your fuel rail / Fuel Hose. Let a friend checking the fuel pressure while you are cycling the ignition. The fuel pump should normally prime around 10 seconds after you have turned on the ignition. Start your car to check your fuel pressure

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If you get no fuel pressure

If you do not get any fuel pressure, you should diagnose the following parts:

  • Fuel pump
  • Fuel pump relay
  • Fuel pump wirings
  • Fuel filter
  • Fuel pressure regulator
  • Internal leak inside fuel tank on fuel pressure hose

Recommended Tools to Fix P0190

If you have any other questions about the P0190 code, comment down below and I will answer you as fast as possible. If you have any other car questions you are welcome to ask us at our homepage.


To find all OBD2 codes. Check our OBD2 Code List.

Hello I'm Magnus, the owner and the writer of this website. I have been working with cars since I was 16 and I'm specialized with in-depth Automotive diagnostics. Also been driving drifting for the last 6 years. I'm here to give you answers to all your automotive questions and I hope that you enjoy our content.

  1. Hi, Thanks for helpful description.
    I am getting a OBD2 message “Low fuel pressure sensor reading high” together with the emissionswarning light on my Volvo V40. As it is reading high I presume this would not be a fuel pump failure so is more likely to be a faulty sensor.

    1. Author

      Yes it sounds like a faulty signal from the pressure sensor. If you have a scanner you can check the value from the fuel pressure sensor to check if it’s realistic or not.

  2. hi just come across this- and it is soooo much more informative that an actual car forum
    wife has a nissan quashqai and gets this code,
    by reading this, there are a lot of things i can do and check before handing to a garage,
    thanks you

  3. Hi there
    After all thanks a lot for what you did
    It’s awesome
    But I need a little help with my car Mitsubishi pajero pinin (GDI)
    Doesn’t start just cranking
    When I drop some fuel into throttle body it starts then goes off again cuz the fuel is finished
    I also changed the hpfp and crankshaft sensor and clean up the all four injectors and new spark plugs
    I wish a little help

  4. Where does the fuel pressure sensor circuit of nissan cedric vq30dd located

  5. hi guys im on bmw e90 and i have a fuel rail sensor HS when checking hiring no elecrtical signal comes to from ecu

  6. hi, i have Mitsubishi chariot 1998 model 4G64 ,it cranks with misfire and stays on rough idle for 5 seconds then goes off and also it idle when you persistently hold the key at the start position n it goes off the moment you leave the key.

    Tried to change plugs throttle sensor works very well, it opens clearly.

    what could be the problem

  7. I’m a pajero pinin owner, my car is not keeping idle and i do not know what to do. With the obd ii i have diagnosed a pending fuel rail pressure sensor circuit A. What dotés that mean?

  8. I have a 2005 1.9dci Renault scenic my check injection light comes on when I stop the car and restart it light goes out,may not come back on for days changed the glow plugs but still lights comes on any ideas

  9. Due to a very high demand and high ammount of comments, you have to wait for some time for your car questions to get answered. If you want to get fast answers from a certified master technician you can ask your questions here:
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