Acura check engine codes

Overview

Acura shares engines with Honda, so its check engine patterns closely follow Honda, including misfire related warranty extensions on some engines.

Codes notably common on Acura

• P0420 Catalyst System Efficiency Below Threshold (Bank 1)
• P0300 Random or Multiple Cylinder Misfire Detected

Acura specific notes

• Some Honda and Acura V6 engines with Variable Cylinder Management have been the subject of warranty extensions for misfires caused by oil fouled spark plugs from piston ring problems. Ask an Acura dealer to check your VIN for open coverage.

Owner's manuals

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

Recall lookup

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

Sources

• https://static.nhtsa.gov/odi/tsbs/2025/MC-11022768-0001.pdf
• 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 Acura as on any vehicle:

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