PickGuideTHINKCAR THINKDIAG 2 Review: Best Budget Bidirectional Scanner?
Most OBD2 scanners at this price just read and clear codes. The THINKCAR THINKDIAG 2 goes further: bidirectional control to actively test components, CAN-FD protocol for newer GM vehicles, and 15+ service resets — all from a Bluetooth dongle that works with your phone. The honest question is whether those extras justify $116 more than the $43 THINKDIAG MINI, and for most casual car owners, the answer is no. But for anyone who works on 2020+ GM trucks or needs to run active tests, it's a genuinely different tool.
The THINKDIAG 2 ($159, discounted from $189) connects to your phone via Bluetooth 5.0 and runs through the ThinkDiag app on iOS or Android. It covers full-system diagnostics across all vehicle modules — engine, ABS, SRS airbags, transmission, HVAC, body control — not just the engine codes that basic scanners read. What sets it apart from every other scanner in this price range: CAN-FD protocol support (required for communicating with 2020+ GM vehicles that use the newer protocol), bidirectional active tests (you can actually command components like ABS pumps, fuel injectors, and solenoids to test if they respond), and IMMO key matching for certain vehicles. AutoVIN reads your vehicle in about 10 seconds. 15+ service resets cover oil lamp, EPB, SAS, DPF, TPMS, battery registration, and more. Software is included free for the first year; annual renewal is required after that — unlike the MINI, which is lifetime-free. 482 verified reviews, 83% five-star. Coupon code DXVZQUAH takes 10% off at checkout.
Pros
- Bidirectional active tests — can command ABS pumps, injectors, and solenoids; not just read data
- CAN-FD support — the only way to properly communicate with 2020+ GM vehicles at this price
- Full-system diagnostics including all modules, not just engine codes
- Bluetooth 5.0 for faster, more stable connection than older Bluetooth specs
- 482 reviews at 83% five-star — substantially larger sample than comparable tools
Cons
- Annual software subscription required after first year — unlike the lifetime-free THINKDIAG MINI
- Requires a smartphone — and no standalone screen; your phone needs to be nearby and charged
- Not the right tool for basic code reading if you just need engine light diagnostics
- No CAN-FD for non-GM applications — most vehicles still use CAN, which this covers, but the CAN-FD advantage is GM-specific
Who It's For
Good For
- Anyone who works on 2020+ GM vehicles (Silverado, Sierra, Equinox, etc.) that require CAN-FD
- DIY mechanics who need to run active component tests without visiting a shop
- Car owners who want professional-level diagnostics without a shop-grade tool price
Skip If
- You only need to read and clear engine codes — the $43 THINKDIAG MINI does that with no annual fees
- You prefer a standalone screen without a phone dependency — look at the THINKSCAN PLUS S7
- You work exclusively on pre-2020 non-GM vehicles where CAN-FD doesn't apply
How It Compares: THINKCAR THINKDIAG 2 vs THINKDIAG MINI ($43)
| Spec | THINKCAR THINKDIAG 2 | THINKDIAG MINI ($43) |
|---|---|---|
| Price | $159 | $43 |
| Bidirectional | Yes | No |
| CAN-FD (2020+ GM) | Yes | No |
| IMMO key matching | Yes | No |
| Software renewal | Annual fee after yr 1 | Lifetime free |
| Bluetooth | 5.0 | 4.2 |
| Full system scan | Yes | Yes |
| Service resets | 15+ | 15+ |
Key Specs
| Price | $159 (sale from $189) |
| Connection | Bluetooth 5.0 to smartphone |
| Protocols | CAN, CAN-FD, K-Line, ISO9141 |
| Systems covered | All modules (engine, ABS, SRS, TCM, HVAC, BCM) |
| Bidirectional | Yes — active component testing |
| Service resets | 15+ (oil, EPB, SAS, DPF, TPMS, BMS, ABS bleed, more) |
| IMMO key matching | Yes |
| AutoVIN | Yes — reads vehicle in ~10 seconds |
| Software | Free year 1; annual subscription after |
| App | ThinkDiag (iOS + Android) |
| Reviews | 482 verified, 83% five-star |
Verdict
The THINKDIAG 2 earns its premium over the MINI for two specific reasons: bidirectional active tests and CAN-FD support for newer GM vehicles. If you need either of those, it's the best option at this price. If you don't — and most everyday car owners won't — the $43 THINKDIAG MINI handles full-system diagnostics and 15 resets without a subscription. Choose based on what you actually need, not just the spec list.