Autel IM508/IM508S vs IM608 PRO/II: A Locksmith’s Guide

Choosing the right key programmer is a tough call through all the hype. Let’s look at what really matters for a working locksmith: what keys and vehicles it can program, how deep the diagnostics go, how solid the hardware is, and how smoothly it runs on the job. The Autel MaxiIM line splits into two tiers: the IM508 (and upgraded IM508S), and the IM608 PRO (and new IM608 PRO II). Each has pros and cons. Here’s how they differ.

• Core IMMO Coverage: All these Autel tools do standard OBD key learning, PIN reading, and key generation on most makes and models. They handle basic jobs like reading transponder IDs and adding keys for domestic cars and many imports. In smart-mode (guided key learning), even the IM508/S works fine on 90% of common jobs. Both the IM508 and IM608 families support PIN reading (all-key-lost), key write, remote learning, and backing up/restoring immobilizer data.

• Advanced ECUs: The differences show up on fancy European stuff. BMW CAS4/CAS5 keys, Mercedes 3rd-gen (infrared) keys, and other high-end systems often require the extra hardware or processing power. On the IM508/S, functions like BMW CAS4 key learning only work with the XP400 adapter connected, whereas the IM608 handles CAS4 natively (and even more, especially the PRO II). Likewise, third-gen Mercedes OBD key programming is “available when connected to XP400” on the IM508, but is standard on the IM608 PRO. In short: IM508 + XP400 = IM608 in IMMO. Autel’s own spec chart confirms that hooking up the XP400 key module to an IM508 unlocks the same immobilizer functions as the IM608 family.

• What about XP400? It’s a separate handheld programmer that plugs into the tablet and reads/writes keys, EEPROM and MCUs. With XP400 you get Mercedes IR key coding, Hyundai/Kia smart-chip keys, password calculation for old Mercedes modules, etc. Without XP400, the IM508/S alone will struggle or outright refuse on some jobs (like certain BMW/Merc CAS modules, Subaru “H-chip” keys, etc.).

• IM508 vs IM508S: The S is basically a faster, newer IM508 under the hood. It has a stronger CPU, Android 11, and 4GB RAM + 64GB storage instead of 1GB/32GB. In real work, this means the IM508S is better handling larger data sets. However, function-wise they both use the same key adapter (XP200 by default) and have the same code tables. So the S only helps on speed and future-proofing, not on adding new key functions. You’ll still need an XP400 for the really tough keys.

• IM608 PRO vs IM608 PRO II: The IM608 PRO is Autel’s top-of-the-line programmer/scan tool (until 2024). In late 2024, Autel released the IM608 PRO II (sometimes called IM608 II or IM608S II). The PRO II has a much faster Snapdragon chip, Android 10, and 4GB RAM + 128GB storage, versus the original’s older Exynos, Android 4.4, and 2GB/64GB. Both have the same 10.1″ 1920×1200 screen and 15,000 mAh battery, but the PRO II boots faster and handles data-heavy tasks without choking. In practice, the PRO II is simply quicker on diagnostics and programming, especially when doing big scans or ECU reflashes. For day-to-day key jobs the difference is less dramatic, but every second counts on the bench.

• Who needs which? If you do only basic key work (domestics and not-too- exotic imports), an IM508 (or S) plus XP400 covers almost everything you’ll hit. The IM608/PRO line shines if you also do full car diagnostics, module coding, or you regularly face security systems on German/Asian luxury cars. Autel’s own advice is: IM508 is fine for basics, but for complete coverage and advanced diagnostics, go IM608.

• Scanner Depth: Inside the diagnostics realm, the IM608 units are way ahead. IM608 can scan all systems on 80+ makes and has a built-in J2534/VCI for ECU reprogramming. The IM508 can read/erase codes and do active tests on major modules, but it lacks OEM-level access in many cases (no built-in J2534 or any programming beyond keys).

• Service/Resets: Both tools handle routine resets (oil service, brake bleeding, SAS, battery calibration, DPF regen, TPMS, etc.). Neither does online/offline ECU coding except through limited functions. However, only the IM608 can do full ECU coding and complete service on modules (IM508’s “Complete Service” is basic vs IM608’s advanced). If a car needs reprogramming a module or coding anti-theft data, you want an IM608. The IM508 won’t have that menu. 

• New Protocols: The latest IM608 PRO II (S II) can handle DoIP and CAN-FD networks (with optional adapters). This targets the very newest models (late-model Land Rovers/Jag/Lexus, etc.). The IM508 and original IM608 Pro cannot natively do DoIP or CAN-FD. For most key tasks this won’t matter, but it’s a factor if you want full diagnostic coverage on cutting-edge vehicles.

• Anti-Theft Toolbox: On immobilizer specifics, the IM608 tools have a wider built-in arsenal. For example, an IM608 can OBD-program BMW FEM/BDC, EWS, VW MQB, Audi C, etc., all by itself. The IM508 can do these too but often requires additional adapters or the XP400 to read module dumps. For instance, BMW CAS4 key adaptation is only on the IM508 with XP400, while the IM608 does it out of the box. Same with certain Audis and Mercedes keys. IM608 PRO/II = more key/immobilizer “power” built-in; IM508 needs help (XP400 and patience) to match it.

• Screen & Display: IM508 and IM508S share a 7″ 1024×600 screen. The IM608 and IM608 II both use a 10.1″ 1920×1200 screen. That’s a big step up – on dark shop nights or reading tiny ECU labels, the IM608’s HD screen is much easier on the eyes. It also makes data lists and graphing live data more user-friendly. The IM608’s larger touchscreen also comes with an 8MP camera; the IM508 has none.

• Build & Battery: The IM508/S tablets are lighter and pocketable, but their 5000 mAh battery is on the small side. You’ll be charging more often during a long day. The IM608 tablets have a hefty 15,000 mAh pack – three times more – and thus last all day. In a job site scenario, the IM608’s bigger battery and faster processor means less downtime. 

• Memory/Speed: The IM508S and IM608 PRO II both sport 4 GB+ RAM and 64/128 GB storage, while the original IM508 and IM608 PRO only have 1–2 GB RAM and 32–64 GB storage. More RAM means you can keep the diagnostic app, VIN scan, key software, etc. all active without slowdown. In practice, the IM508 (1 GB RAM) can feel sluggish if you leave data loaded or jump between menus. The IM508S (4 GB) is noticeably faster, but still behind the IM608 Pro II (4 GB with a better CPU) in raw performance. IM608 PRO II boots faster and runs the Autel software more smoothly under heavy use.

• Connectivity: Both tablet lines have Wi-Fi for updates and remote support, and USB/BT connectivity. The IM608 PRO II adds Bluetooth 5.0 (vs 2.1 on the old PRO) for better wireless key-sniffing or J2534 connection. The IM508 series has Wi-Fi but no built-in Bluetooth. If you rely on wireless scan/flash or remote expert features, that’s another win for the IM608 PRO II. Both have multilingual support and solid hardware construction.

• Scan Speed: the IM608 is generally faster at full-system scans. Its more powerful processor handles all-model scans without freezing. The IM508 will scan everything too, but it’s akin to how an older laptop with 2 GB RAM struggles with multi-tasking – it gets there, but slower. Locksmiths report the IM508 can be noticeably sluggish on busy vehicles, while the IM608 lineup behaves much more responsively.

• Online/Offline: Both tools usually need an internet connection for some jobs (Autel often calculates PIN codes on their servers). Expect to be “WiFi-ready” especially for obscure immo tasks. The IM608’s bigger hardware doesn’t remove the need for Net PINs, but it’s less likely to choke mid-process. Also, the IM608 can serve as a true J2534 pass-thru (flash ECUs), which the IM508 cannot.

• Daily Job Speed: Consider practicalities: grabbing the IM508 is faster (smaller), but the IM608 saves you time in lengthy procedures. If you spend most of a day programming keys and doing full diagnostics at a shop bench, that extra speed and screen real estate on the IM608 is money in the bank. If you’re a one-man mobile guy doing occasional key jobs, the IM508 combo might suffice and save cost and bulk.

• Coverage vs Cost: Locksmiths often ask, “Do I really need the IM608, or is an IM508 enough?” If you mostly do domestic or simple foreign models, the IM508 (especially the new S version) will handle it – and it’s cheaper. But remember, even US cars are getting more complex anti-theft these days. The IM608 stands out on late-model GM, Chrysler, Toyota (especially “H-chip” Toyotas that some owners noted the 2013 Rav4 couldn’t handle without a 608), Land Rover, Volvo, Mercedes, etc. If your work includes those, the IM608 is safer long-term.

• Hardware Reliability: Both devices are well-built Android tablets. In years of use, Autel tools tend to be reliable if treated well. Battery, however, is a point: the IM608’s giant Li-ion holds up longer and likely gives more charge cycles than the smaller pack in the IM508. In terms of durability, bump or drop damage is possible on either, so a rugged case is a good idea on the road.

• Software Updates: Autel provides updates for all models. Factor update cost into your budget – it’s not mandatory to keep scanning, but needed to learn new models.

• Anti-Theft vs OBDII Scanner: A lot of locksmiths actually need both worlds. You want the IMMO functions to pull key PINs, add keys, etc., but you also often read codes or test an ignition switch. The IM608 does all that. With an IM508, you get some basic OBDII scanning too, but it’s “entry-level”. If diagnosing fault codes is part of your business, lean IM608. If not, focus on key features.

• Autel IM508 (or IM508S + XP400 Pro): Budget-friendly, light and portable. Good for general key programming (domestic/import) and basic diagnostics on common vehicles. The IM508S with more RAM/Android is a worthwhile step up. Add the XP400 Pro if you frequently hit Mercedes IR keys, newer BMW, Toyota H-chip, etc. This combo equals an IM608 in IMMO functions, but still lacks the advanced scanner functions of the IM608. If price is a concern and you mostly do keys, this setup earns its keep.

• Autel IM608 PRO: Mid-priced all-in-one. Full-featured key tool and true OE-level diagnostics. Out-of-the-box supports every key job the IM508 needs XP400 for, and adds ECU coding, J2534 flashing, DoIP (with adapter), and complete active testing on cars. Its 10″ high-res display and beefy battery make it fast on the job. For a locksmith who also does lots of system diagnostics or services, this is often the most balanced choice.

• Autel IM608 PRO II (IM608 II): The top-tier model. Same feature-set as the PRO but with modern hardware (4GB RAM, Android 10, Bluetooth 5). It’s notably quicker at multitasking and future-proofs you for the newest cars. If budget allows and you want the fastest, most powerful tool Autel offers, this is it. It will chew through multiple scans and key jobs without blinking.

In practice: if your work is 70% keys and 30% scanning, a well-equipped IM508S (with XP400) will do it. But if scanning and diagnostics are 70% of your day, swallow the extra cost of an IM608. It’s not just “which is best” – it’s “which is best for you.”

• Programming Power: IM508+XP400 ≈ IM608 PRO for keys. But IM608 does more models natively (no extras).

  
  If you’re dealing with newer cars using CAN FD or DoIP, or need advanced diagnostics (ECU flashing, module adaptation), go with IM608 PRO or IM608 II.

  IM608 II has the widest vehicle protocol support— it’s ready for modern and future vehicle networks.
  

• Diagnostics: IM608 (especially PRO II) has full OE-level coverage; IM508 is limited. No ECU coding on IM508.

• Hardware: IM608 tablets have larger battery, screen, and double memory. IM508S improves CPU and RAM over the old 508.

• Speed: IM608 boots, scans, and processes data faster – meaning less waiting around during a job.

• Budget vs Features: IM508 family is cheaper. IM608 family gives more everything. Pick the one that covers your day-to-day tasks without breaking the bank.

Choose smart, and the tool will pay for itself by getting you off the job faster and handling the tough jobs without surprise delays. Good luck out there – and happy programming.