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Engine-Codes – Generic – P1186

P1186 Code - Fuel Pressure Monitoring-Minimum Pressure at Engine Speed Too Low

Quick Answer

The P1186 diagnostic trouble code indicates that the fuel pressure monitoring system has detected that the minimum pressure at engine speed is too low. Common causes include Faulty fuel pump, Clogged fuel filter, Malfunctioning fuel pressure regulator. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1186 indicates Fuel Pressure Monitoring-Minimum Pressure at Engine Speed Too Low.
Common causes
Common causes include Faulty fuel pump, Clogged fuel filter, Malfunctioning fuel pressure regulator.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code P1186 Description

The P1186 diagnostic trouble code indicates that the fuel pressure monitoring system has detected that the minimum pressure at engine speed is too low. This can lead to a variety of issues within the vehicle's fuel system, affecting its performance and efficiency.

OBDII Code P1186 - Fuel Pressure Monitoring-Minimum Pressure at Engine Speed Too Low
P1186 Code - Fuel Pressure Monitoring-Minimum Pressure at Engine Speed Too Low

Common Causes of P1186

  1. Faulty fuel pump
  2. Clogged fuel filter
  3. Malfunctioning fuel pressure regulator
  4. Dirty or clogged fuel injectors
  5. Fuel system leak

Symptoms of P1186

  1. Difficulty starting the engine
  2. Rough idling or engine misfires
  3. Hesitation or lack of power during acceleration
  4. Stalling or engine shutdown while driving

How to Fix P1186

  1. Perform a fuel pressure test to determine the exact cause of the low pressure.
  2. Inspect and, if necessary, replace the fuel pump.
  3. Check and replace the fuel filter if it is clogged.
  4. Test and, if needed, replace the fuel pressure regulator.
  5. Clean or replace the fuel injectors if they are dirty or clogged.

Cost to Fix P1186

The cost of repairing a P1186 code can vary depending on the specific cause of the issue and the type of vehicle. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. It is important to consider the diagnostic time and labor rates at auto repair shops, which can vary based on location, make and model of the vehicle, and engine type. It is recommended to obtain quotes from multiple shops to ensure a fair price for the repair.

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Code P1186 Information for Specific Makes

  • P1186 Audi — Linear Oxygen Sensor Common Ground Short To Positive
  • P1186 BMW — O2 Sensor Heater Control Circuit Bank 1 Sensor 2
  • P1186 Buick — Engine Oil Temperature Sensor Circuit Performance
  • P1186 Cadillac — Engine Oil Temperature Sensor Circuit Performance
  • P1186 Chevrolet — Engine Oil Temperature Sensor Circuit Performance
  • P1186 Ford — Fuel Pump Temperature Sensor Low
  • P1186 GMC — Engine Oil Temperature Sensor Circuit Performance
  • P1186 Hyundai — Fuel Pressure Monitoring-Minimum Pressure at Engine Speed Too Low
  • P1186 KIA — Fuel Pressure Monitoring-Minimum Pressure at Engine Speed Too Low
  • P1186 MINI — O2 Sensor Heater Control Circuit Bank 1 Sensor 2
  • P1186 Volkswagen — Linear Oxygen Sensor Common Ground Short To Positive
About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1186 Code

1. What are the common symptoms of OBDII code P1186?

- Common symptoms of code P1186 include reduced engine performance, rough idling, stalling, and difficulty starting the vehicle.

2. What are the possible causes of OBDII code P1186?

- Possible causes of code P1186 include a faulty fuel pressure regulator, clogged fuel filter, weak fuel pump, fuel system leaks, or issues with the fuel pressure sensor.

3. How can I diagnose the root cause of OBDII code P1186?

- Diagnosing code P1186 involves checking the fuel pressure using a gauge, inspecting the fuel pressure regulator, fuel filter, fuel pump, and fuel lines for any issues, and testing the fuel pressure sensor for proper functionality.

4. Can I still drive my vehicle with OBDII code P1186?

- It is not recommended to drive your vehicle with OBDII code P1186, as it can lead to further damage to the engine and potentially unsafe driving conditions.

5. How can I repair OBDII code P1186?

- Repairing code P1186 involves addressing the root cause of the issue, which may include replacing the fuel pressure regulator, fuel filter, fuel pump, or repairing any fuel system leaks. It is recommended to consult a professional mechanic for a proper repair.

6. Is it safe to reset the OBDII code P1186 and continue driving?

- Resetting the code without addressing the underlying issue is not recommended, as the problem may persist and potentially cause more severe engine damage. It is best to diagnose and repair the root cause of the code before driving the vehicle.

7. Can a dirty fuel injector cause OBDII code P1186?

- While a dirty fuel injector may not directly cause OBDII code P1186, it can contribute to fuel delivery issues that may lead to low fuel pressure, which can trigger the code.

8. Will using a fuel system cleaner help resolve OBDII code P1186?

- Using a fuel system cleaner may help improve fuel system performance, but it is unlikely to resolve OBDII code P1186 if the issue is related to a faulty component such as the fuel pressure regulator or fuel pump.

9. How often should the fuel pressure system be inspected to prevent OBDII code P1186?

- It is recommended to have the fuel pressure system inspected as part of regular maintenance, especially if you notice any symptoms of low fuel pressure. Regular inspections can help prevent issues that may trigger code P1186.

10. Can extreme weather conditions affect the fuel pressure system and trigger OBDII code P1186?

- Extreme weather conditions, such as extreme heat or cold, can affect the fuel pressure system and may contribute to issues that trigger code P1186. It is important to monitor your vehicle's performance in varying weather conditions and address any abnormalities promptly.

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