Actron PocketScan Plus CP9550 OBD II & CAN Code Reader

When your check engine light comes on, the Actron PocketScan Plus CP9550 gives you answers in about 30 seconds — plug it into the OBD II port, turn the key, and the screen shows the trouble code along with a plain-English explanation of what it means. No phone app, no subscription, no pairing needed.

The CP9550 stores over 4,000 code definitions on-board, covering generic and manufacturer-specific codes across all OBD II and CAN-compliant vehicles from 1996 and newer (plus some 1994-1995 OBD II-compliant models). Beyond reading and clearing codes, it pulls Freeze Frame data so you can see the exact engine conditions — RPM, coolant temp, fuel trim — at the moment the code triggered. The Inspection and Maintenance readiness monitor display tells you whether your vehicle is ready to pass an emissions test.

Actron added urgency indicators that flag whether a code is something you can monitor or something that needs immediate attention, which is a useful detail when you are deciding whether to drive to the shop or call a tow truck. The unit is compact at 9.3 by 6.3 by 1.4 inches and weighs under a pound, so it fits easily in a glovebox or tool bag.