P1137Manufacturer-specific code

P1137 Code: Long Term Fuel Trim Additive (Air), Bank 1: System Too Rich (Volkswagen)

On Volkswagen, Audi, Seat and Skoda, the P1137 code means the additive (air) long term fuel trim on bank 1 ran out of range because the mixture was too rich. Expect high fuel use. A stuck-open purge valve or a leaking injector is a common cause.

Severity
Medium
Can I keep driving?
Yes, but with caution
Estimated cost
$20 to $500
Difficulty
Medium
System
Air and Fuel
Applies to
Depends on the manufacturer

Common in: Audi, Seat, Volkswagen

Updated Reviewed by Renzo Chacca

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What the P1137 code means

P1137 is a manufacturer-specific code: the 1 in the second position means each automaker defines what it stands for, not the generic standard. The most widespread definition is the one used by Volkswagen, Audi, Seat and Skoda. If your vehicle is another brand, confirm the code text with a scan tool that supports that manufacturer.

ManufacturerMeaning of P1137
Volkswagen, Audi, Seat and SkodaLong term fuel trim, additive (air), bank 1: system too rich

Volkswagen splits the learned mixture correction into two parts: the multiplicative part, which counts more under load, and the additive part, which counts more at idle because it makes up for air that enters without being measured.

The computer sets the P1137 code when the additive (air) correction reached its limit because the mixture was too rich. A failing additive part points to a mixture problem at idle.

Before you repair anything, confirm the make, model, year and engine. With manufacturer codes, the same number can change even between engines from the same brand.

P1137 code symptoms

  • Check engine light on.
  • High fuel use.
  • Smell of fuel.

Likely causes of the P1137 code

  1. Canister purge valve stuck open. Test it by activating it with the scan tool.
  2. Leaking injector. Confirm it with the tests in the diagnosis section.
  3. High fuel pressure. Confirm it with the tests in the diagnosis section.
  4. Oil diluted with gasoline. Check the level, condition and viscosity.

How to diagnose the P1137 code step by step

  1. Read the mixture measuring blocks with VCDS or a compatible scan tool.
  2. Check the purge valve.
  3. Check the MAF sensor and the idle airflow for your engine size.
  4. Measure the fuel pressure.

How to fix the P1137 code

  • Repair the leak or the failed component.
  • Reset the mixture adaptations.
  • Verify in the measuring blocks that the P1137 code does not come back.

Technical reference data

  • Normal adaptation: within about plus or minus 10 percent.
  • P1xxx codes are manufacturer-specific: confirm the definition with a scan tool that supports your brand.
  • Values are approximate: check the manufacturer data for your vehicle.

Brand-specific notes

Common on the Volkswagen Golf, Jetta, Bora, Polo and Passat, the Audi A3 and A4, and the Seat Ibiza and Leon.

If your vehicle is another brand, check the table above for the meaning its manufacturer gives the code, and confirm it with a scan tool that supports that brand.

Frequently asked questions about P1137

What does the P1137 code mean on a Volkswagen?
It means the additive (air) long term fuel trim on bank 1 ran out of range because the mixture was too rich. Fuel use is high.
Does P1137 mean the same thing on every brand?
No. It is a manufacturer code, and on other brands it may not exist or it may mean something else.
Can I drive with a P1137 code?
Yes, with caution. A rich mixture wastes fuel and can foul the spark plugs and the catalytic converter, so do not wait long to repair it.
How much does it cost to fix P1137?
On a Volkswagen the cost runs from about $20 to $500. A purge valve is on the cheap end, while injectors or fuel pressure parts cost more.
Will a P1137 code clear itself?
No, not while the cause is still there. Clearing the adaptations may turn the light off for a while, but the code returns until the rich condition is fixed.
What is the most common cause of P1137?
A canister purge valve stuck open, followed by a leaking injector or high fuel pressure. Also check the oil for gasoline dilution.

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Questions about the P1137 code

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