Repair & Diagnostic Guides
Practical walkthroughs for everything from reading your first trouble code to passing an emissions test.
All Guides
Reading & Clearing DTC Codes
Learn what P, C, B, and U codes mean, how to read them in Wrench Buddy, when it's safe to clear them, and how to use repair estimates and DIY difficulty ratings.
OBD2 Readiness & Mode 06
Understand what readiness monitors are, why they matter for emissions tests, how to use the Readiness Check screen, and what to do when monitors show "Not Ready."
Bluetooth Adapter Setup
Choose the right ELM327 adapter, pair it with Android, connect through Wrench Buddy, and troubleshoot the most common connection problems.
New to OBD2?
Start with the Bluetooth Setup guide to get your adapter connected, then head to Reading DTC Codes to understand what your car is telling you.