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Engine-Codes – Generic – P1086

P1086 Code - Fuel Control Mixture Rich Bank 2 Sensor 1

Quick Answer

The P1086 diagnostic trouble code indicates a problem with the fuel control mixture being too rich on bank 2 sensor 1 in the vehicle's engine. Common causes include Faulty oxygen sensor, Vacuum leak, Malfunctioning fuel injector. 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
P1086 indicates Fuel Control Mixture Rich Bank 2 Sensor 1.
Common causes
Common causes include Faulty oxygen sensor, Vacuum leak, Malfunctioning fuel injector.
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 Sep 07, 2024
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Code P1086 Description

The P1086 diagnostic trouble code indicates a problem with the fuel control mixture being too rich on bank 2 sensor 1 in the vehicle's engine. This code is usually related to the oxygen sensor located before the catalytic converter on the bank 2 side of the engine. The oxygen sensor plays a crucial role in monitoring the air-fuel ratio in the exhaust gases and sending feedback to the engine control module (ECM) to adjust the fuel mixture for optimal combustion.

OBDII Code P1086 - Fuel Control Mixture Rich Bank 2 Sensor 1
P1086 Code - Fuel Control Mixture Rich Bank 2 Sensor 1

Common Causes of P1086

  1. Faulty oxygen sensor
  2. Vacuum leak
  3. Malfunctioning fuel injector
  4. Clogged air filter
  5. Fuel pressure regulator problem

Symptoms of P1086

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Engine misfires
  4. Strong fuel odor from the exhaust
  5. Check Engine Light illuminated

How to Fix P1086

  1. Diagnose the issue using a scan tool to determine the exact cause of the rich fuel mixture.
  2. Inspect the oxygen sensor on bank 2 sensor 1 and replace it if faulty.
  3. Check for vacuum leaks and repair or replace any damaged hoses.
  4. Test the fuel injectors and clean or replace any that are not functioning correctly.
  5. Inspect the air filter and replace if dirty, and check the fuel pressure regulator for proper operation.

Cost to Fix P1086

The cost of repairing a P1086 code can vary depending on the specific cause of the issue and the parts and labor required. In general, the cost of replacing an oxygen sensor can range from $100 to $300, while repairing a vacuum leak or replacing a fuel injector can cost anywhere from $150 to $500. Overall, the total repair cost for addressing a rich fuel mixture on bank 2 sensor 1 could range from $200 to $800, including parts and labor. It's important to note that labor rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple providers to get an accurate estimate.

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Code P1086 Information for Specific Makes

  • P1086 Audi — Exhaust Bank 4- Mixture Adaption Range 2 Lower Lean Limit Not Reached
  • P1086 BMW — Fuel Control Mixture Rich Bank 2 Sensor 1
  • P1086 MINI — Fuel Control Mixture Rich Bank 2 Sensor 1
  • P1086 Subaru — Tumble Generated Valve Position Circuit Low Sensor 2
  • P1086 Volkswagen — Exhaust Bank 4- Mixture Adaption Range 2 Lower Lean Limit Not Reached
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 P1086 Code

1. What are the common symptoms of OBDII code P1086?

The common symptoms of OBDII code P1086 include poor fuel economy, rough idle, engine misfires, and a strong smell of fuel from the exhaust.

2. What does the OBDII code P1086 Fuel Control Mixture Rich Bank 2 Sensor 1 indicate?

OBDII code P1086 indicates that the fuel mixture in Bank 2 Sensor 1 is too rich, meaning there is an excess of fuel compared to air in the combustion process.

3. What are the possible causes of OBDII code P1086?

Common causes of OBDII code P1086 include a faulty oxygen sensor, issues with the fuel injectors, a vacuum leak, a malfunctioning mass airflow sensor, or a problem with the fuel pressure regulator.

4. How can I diagnose the OBDII code P1086?

To diagnose OBDII code P1086, you can use an OBDII scanner to read the code and further investigate the oxygen sensor, fuel injectors, vacuum system, mass airflow sensor, and fuel pressure regulator for any signs of malfunction.

5. How can I repair OBDII code P1086?

Repairing OBDII code P1086 may involve replacing the oxygen sensor, cleaning or replacing the fuel injectors, fixing any vacuum leaks, replacing the mass airflow sensor, or repairing or replacing the fuel pressure regulator as needed.

6. Can driving with OBDII code P1086 cause further damage to the vehicle?

Continued driving with OBDII code P1086 can potentially lead to damage to the catalytic converter, reduced engine performance, and increased fuel consumption over time if left unresolved.

7. Is it safe to continue driving with OBDII code P1086?

While it may be safe to drive in the short term, it is recommended to address OBDII code P1086 promptly to prevent potential damage to the vehicle and ensure optimal engine performance and fuel efficiency.

8. How much does it typically cost to repair OBDII code P1086?

The cost of repairing OBDII code P1086 can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Can OBDII code P1086 be triggered by a loose gas cap?

While a loose gas cap can trigger a different code related to the evaporative emissions system, it is unlikely to directly cause OBDII code P1086 related to a rich fuel mixture in Bank 2 Sensor 1.

10. How often should I check for OBDII code P1086?

If you suspect an issue with your vehicle's fuel control system or experience symptoms related to a rich fuel mixture, it is recommended to check for OBDII code P1086 promptly to address any underlying problems.

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