Your choice

Your privacy

Storage needed for the site. Visit and search statistics are optional and start only with your permission. Privacy policy

Skip to content
Back to list

OBD code information sheet

https://dvireports.com/p0440/audi

Fault codes DVI Reports
P0440Audi

Missing fuel cap, Defective or damaged fuel cap, Distorted or damaged Fuel Tank Filler Neck, Torn or punctured Evaporative system hose(s), Defective Fuel Tank Sending Unit…

Safe to keep driving?Caution / Repair soonArrange diagnosis soon

Arrange diagnosis soon. A limited journey may be reasonable only if the vehicle runs normally without red warnings, abnormal temperature or severe loss of power. Stop safely if serious symptoms develop.

LowCautionCritical
System groupEngine & powertrain
Selected definitionAudi1 definitions availableChange

Choose the make reported by the scan tool or vehicle documentation. The same code can have different manufacturer meanings.

General catalogue definitionAudi

Technical explanation

Missing fuel cap, Defective or damaged fuel cap, Distorted or damaged Fuel Tank Filler Neck, Torn or punctured Evaporative system hose(s), Defective Fuel Tank Sending Unit gasket or seal, Split or damaged Carbon Canister, Defective Evaporative Vent Valve and or Evaporative Purge Valve, Defective or damaged fuel tank. Source catalogue definition; confirm applicability using vehicle service information.

Check the fuses before ordering a part

An OBD code describes a detected condition; it does not tell you which part to replace. Start with the fuse for the affected circuit.

Find the fuse for your vehicleChoose the make and model, then look up the fuse position in the catalogue.

If the fuse is good, carry on like this:

  1. Check the relevant supplies and connectionsWhere the diagnostic procedure calls for electrical checks, verify supply, ground and connectors under the manufacturer’s activation conditions.
  2. Run the specified component testUse the manufacturer’s test for this code and component before deciding it has failed.
  3. Order only after the fault is demonstratedReplace a part only when the prescribed tests identify it as defective.
Check details
  • Identify the circuit and any relevant fuse: Confirm the vehicle, engine, code meaning and stored operating conditions first. A fuse link is a location aid, not evidence that the fuse caused this code. Use the specified type and rating; do not repeatedly replace a fuse that opens.
  • Check the relevant supplies and connections: Use the specified engine state, circuit conditions and expected values. Have live measurements performed by someone qualified. For non-electrical faults, follow the relevant mechanical, fluid, pressure or leak checks instead.
  • Run the specified component test: Do not apply a generic resistance range. Any resistance or continuity test requires a de-energized circuit and an isolated component, with the correct pins and temperature from the procedure. Some components need a different kind of test.
  • Order only after the fault is demonstrated: If results are normal, continue the relevant wiring, control, mechanical or intermittent diagnosis. Check for related faults and verify the repair under the required conditions. A code or a completed checklist alone does not justify replacement.
Fluke · Continuity testing

If the procedure involves airbag/SRS, pretensioners or a high-voltage system, stop DIY testing and use qualified service. Do not probe these circuits with a multimeter.

Vehicle experiences and cases

User-reported cases published after moderation. Approval does not verify the diagnosis; the same code can have different causes.

No experiences have been published for this definition yet. You can be the first to share the checks and outcome.

See all vehicle experiences

Manuals, components and vehicle guides

Find the relevant procedure in the workshop manual for your vehicle. A fault code alone does not identify a failed part, powertrain or exact schematic.

Find workshop manual / diagramRelated issues and checks

Manuals open at their original source. Exact diagram availability depends on the build year, engine and manufacturer access.

Fuel-vapour control

General system guidance · not a confirmed diagnosis

Purge and leak-detection architectures vary. An EVAP code does not automatically identify the fuel cap.

The association is based on the imported description. This information explains the system; it does not confirm a procedure for the exact code, model or engine. Verify applicability in manufacturer documentation.

Manufacturer-specific definition: verify its meaning and subtype with a compatible tool before using this general guide.

Checks for this type of system

  1. Visually inspect cap, connections and recent work.
  2. Valve and integrity testing must use the vehicle-approved method.

Useful diagnostic data, where available

  • Tank pressure where measured.
  • Purge and vent commands.

Normal values and thresholds vary by vehicle and are not assumed here.

Mistakes to avoid

  • Do not arbitrarily pressurise a fuel tank.
  • Incorrect purge can affect mixture without a failed oxygen sensor.
System-guide sources

References support general principles, not individual verification of every associated code.

Vehicle associations in the catalogue

Catalogue associations help searching and do not confirm code applicability for every model, year and engine combination. Check the vehicle service information.

Make

Audi

Continue your research

Links to related systems, warning lights and vehicle examples.

Check Engine light: meaning and urgencyRead the code with an OBD scanner

Similar codes

P0401Critical / Stop safely

Manufacturer-specific: Audi

Restriction in the EGR passages usually caused by carbon buildup, The EGR Valve is defective, Lack of proper vacuum or electrical signal to the EGR valve, Malfunctioning EGR…

Engine & powertrain

Open sheet
P0420Caution / Repair soon

Manufacturer-specific: Audi

Inefficient Catalytic Converter(s), Defective Front or Rear Oxygen Sensor(s), Misfiring engines

Engine & powertrain

Open sheet
P0430Caution / Repair soon

Manufacturer-specific: Audi

Defective Catalytic Converter, Internal engine damage resulting in high oil consumption and or a leaking Head Gasket has damaged the Catalytic Converter

Engine & powertrain

Open sheet
Report a problem

What should be corrected in this sheet? Do not include names, phone numbers, registration plates or VINs.

Free tool · OBD catalogue

Is this code showing on your vehicle?

See the code meaning and catalogue checks for free. Continue with contextual AI analysis on a PRO plan.

Observed symptoms (optional)

Interpret this code in context.

Describe symptoms, add up to 3 photos and scanner codes if available. Get AI guidance, a PDF and a link for your mechanic — RON 5 / USD 2 / EUR 2 / GBP 1 per case, no subscription.

Analyse with AI Mechanic · from $2 USD

Vehicle reportsFree: 5 reports a month

Want to send this diagnosis to your customer or keep it in a clean PDF with your logo?

Generate a complete report: OBD codes, findings, photos and recommendations, with your workshop details. You can import the codes straight from a photo of the scan tool.

  • Your logo and workshop details
  • Import codes from a photo
  • Photos and findings
  • 13 languages and the customer's currency
Add P0440 to a reportImport codes from a photoSee the template and included checks

5 free reports every month; try it straight away, no subscription.