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Fault code guide

P1086: meaning depends on the car make

Plain English for owners who are not mechanics. We show where each answer comes from, and we say so when it is not known.

What the dictionary says

There is no generic entry for P1086. Manufacturer entries are listed below.

P1086 is a manufacturer-specific OBD fault code, so it means different things on different makes. The dictionary we use has entries for BMW and Subaru. Look it up with your car's make to get the right one.

Manufacturer entries in the dictionary

  • BMW

    Fuel Control Mixture Rich Bank 2 Sensor 1

    Source file

  • Subaru

    Tumble Generator Valve #2 LH Position Sensor Circuit Low Input

    Source file

Reading the code P1086

  • First character: P: Powertrain (engine, transmission and ignition)
  • Second character: 1: a manufacturer-specific code, so the meaning depends on the car make
  • Last three characters: 086: The specific fault within that category.

Reference: On-board diagnostics (Wikipedia)

Terms in this code

  • Lean / rich: Describes the air-to-fuel ratio being burned: lean means more air relative to fuel, rich means more fuel relative to air. More

Related codes

  • P1087 BMW: O2 Sensor Circuit Slow Response in Lean Control Range Bank 1 Sensor 1; Subaru: Tumble Generator Valve #2 LH Position Sensor Circuit High Input
  • P1088 BMW: O2 Sensor Circuit Slow Response in Rich Control Range Bank 1 Sensor 1; Subaru: Tumble Generator Valve #1 RH Position Sensor Circuit Low Input
  • P1089 BMW: O2 Sensor Circuit Slow Response in Lean Control Range Bank 1 Sensor 2; Subaru: Tumble Generator Valve #1 RH Position Sensor Circuit High Input
  • P1090 BMW: Pre-Catalyst Fuel Trim Too Lean Bank 1; Subaru: Tumble Generator Valve #1 RH Malfunction Stuck Open
  • P1091 BMW: Pre-Catalyst Fuel Trim Too Rich Bank 1; Subaru: Tumble Generator Valve #1 RH Malfunction Stuck Close
  • P1092 BMW: Pre-Catalyst Fuel Trim Too Lean Bank 2; Subaru: Tumble Generator Valve #2 LH Malfunction Stuck Open
  • P1093 BMW: Pre-Catalyst Fuel Trim Too Rich Bank 2; Subaru: Tumble Generator Valve #2 LH Malfunction Stuck Close

Singapore notes

LTA's periodic inspection checks a car's exhaust emissions and noise against the prevailing standards, as well as brakes, steering, lights and structure. Cars under 3 years old have no periodic inspection, cars aged 3 to 10 years are inspected every 2 years, and cars over 10 years every year. The dictionary does not say how this code affects an inspection, so ask the inspection centre or a workshop. LTA: vehicle inspection

Need a workshop? See workshops owners recommend or the Subaru list.

What this page does not tell you

The dictionary does not establish repair costs, how likely each cause is, or whether the car is safe to drive. Get a workshop diagnosis and a written quote before paying for parts.

For a make-specific answer, use the lookup below with your make and model. The dictionary has 93 Subaru-specific entries among 18,805 in total.

Look up P1086 for your car

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