Alfa Romeo check engine codes

Overview

Modern Alfa Romeo models sold in the US use turbocharged four cylinder and V6 engines. Boost and sensor faults are the most commonly discussed, but data is limited.

Codes notably common on Alfa Romeo

We have not found well documented brand patterns for our 20 codes on this make. Every code works the same way here as on other vehicles.

Alfa Romeo specific notes

• Turbocharged engines can set P0299 from boost leaks or wastegate issues. Use the general P0299 page.
• Engine codes on this brand behave the same as on any other vehicle. Use the code pages below; the causes and urgency ratings apply.

Owner's manuals

Official Alfa Romeo owner's manual / owner portal (manufacturer site; we do not host copies).

Recall lookup

Check open Alfa Romeo recalls with your VIN at the NHTSA recall lookup.

Sources

• https://www.nhtsa.gov/recalls

Sources checked October 2026. Bulletins apply only to the models and years they list.

All other codes

These work the same on Alfa Romeo as on any vehicle:

P0420 P0430 P0300 P0301 P0302 P0303 P0304 P0171 P0174 P0440 P0442 P0455 P0456 P0128 P0135 P0141 P0101 P0299 P2135 P0401