Volvo OBD Codes
decoded & explained
The codes Volvo owners actually see — misfires, lean mixture, EGR and catalysts — with clear causes and fixes.
Volvo check engine light codes
Volvo uses standard OBD-II engine codes. Older models use VIDA/DiCE tools for deep diagnostics, but most engine faults are readable generically.
Here are the codes most reported on V40, V60, XC60, XC90 and S60 models.
OBD-II code decoder
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Most common Volvo
Classic Volvo faults behind these codes.
| Code | Description |
|---|---|
| P0101 | Mass Air Flow (MAF) Sensor Range/Performance |
| P0113 | Intake Air Temperature Sensor High Input |
| P0128 | Coolant Thermostat Below Regulating Temperature |
| P0171 | System Too Lean (Bank 1) |
| P0300 | Random/Multiple Cylinder Misfire |
| P0401 | EGR Flow Insufficient |
| P0420 | Catalyst System Efficiency Below Threshold (Bank 1) |
| P0442 | EVAP System Small Leak Detected |
Common Volvo faults
Classic Volvo faults behind these codes.
Misfires (P0300) — coils and plugs on petrol engines.
Lean mixture (P0171) — vacuum leaks or MAF issues.
Catalyst efficiency (P0420) — aging converter.
EGR flow (P0401) — carbon buildup on diesel and petrol models.
Thermostat (P0128) — stuck-open thermostat on many models.
Volvo FAQ
Why does my Volvo show P0300?
Is P0401 common on Volvo?
What causes P0171 on a Volvo?
Can I read Volvo codes with a cheap scanner?
Are Volvo and Polestar codes the same?
Codes vary slightly by model, year and engine. Always confirm with a proper diagnosis. Manufacturer-specific codes (P1xxx/P2xxx) may differ from generic descriptions.
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Decode your Volvo code now
Use the free decoder below, or browse the most common Volvo codes.