BOSCH 5551777 Scanner OBD2

( Brand: Bosch ), ( Manufacturer Part Number: 5551777 ), ( Supported System: Abs ), ( Vehicle Type: Passenger Vehicle ), ( Obd Interface: Obdii, Obd ), ( Features: User Friendly )

Review BOSCH Scanner

The **Bosch KTS 550 OBD-II Scanner (Model 5551777)** is a premium, professional-grade diagnostic tool designed to meet the demands of both automotive technicians and enthusiasts seeking deep, reliable insights into vehicle health. Engineered with Bosch s reputation for precision and innovation, this scanner stands out as a versatile, user-friendly device that bridges the gap between basic OBD-II compliance and advanced diagnostic capabilities. Built with a robust, compact form factor, the KTS 550 features a high-resolution, backlit color display that ensures clarity even in low-light conditions, making it ideal for use in garages, repair shops, or on-the-go diagnostics. Unlike many budget-friendly scanners that offer limited functionality, the Bosch KTS 550 supports **ISO 15031-6, ISO 14229-1, and SAE J2534** protocols, allowing it to communicate seamlessly with a wide range of vehicles spanning **OBD-II, OBD-I, and even some non-OBD compliant systems** from manufacturers like Ford, GM, Chrysler, and Toyota. This broad compatibility extends to **EOBD (European On-Board Diagnostics), JOBD (Japanese), and KOBD (Korean) standards**, making it a global solution for technicians working across different markets.

One of the standout features of the Bosch KTS 550 is its **comprehensive fault code reading and clearing capabilities**, which go beyond mere generic OBD-II codes to provide **manufacturer-specific (P0, P2, P3, U0) and enhanced (P1, P3, U1, U2, U3) diagnostic trouble codes (DTCs)**. The scanner interprets these codes with detailed descriptions, often including **symptom triggers, likely causes, and potential solutions**, empowering users to diagnose issues with confidence. Beyond basic code reading, the KTS 550 excels in **live data streaming**, allowing technicians to monitor real-time vehicle parameters such as engine RPM, fuel trim, oxygen sensor voltages, throttle position, and more. This live data is displayed in an intuitive, customizable format, enabling users to track performance trends and identify intermittent faults that might otherwise go unnoticed. For those working on **Euro 4, Euro 5, or Euro 6 compliant vehicles**, the scanner also provides access to **extended emission-related data**, including **EGR flow rates, DPF (Diesel Particulate Filter) status, and SCR (Selective Catalytic Reduction) system diagnostics**, which are critical for modern diesel and gasoline vehicles.

The Bosch KTS 550 is also equipped with **advanced system tests**, such as **injector, ignition, and sensor diagnostics**, which help pinpoint mechanical or electrical issues that may not trigger a DTC. Its **bidirectional control** feature allows users to perform **actuation tests**, such as cycling relays, activating injectors, or triggering solenoids, which can help isolate problems in circuits or components. Additionally, the scanner supports **vehicle identification (VIN decoding)**, providing a wealth of information about the vehicle s make, model, engine type, transmission, and even its emission standards all of which are invaluable for research or repair planning. For users who require **data logging**, the KTS 550 can store diagnostic sessions for later analysis, making it a valuable tool for documenting issues before and after repairs. The device is also **USB-enabled**, allowing users to transfer data to a computer for further analysis using Bosch s **Bosch KTS 550 software**, which offers additional features like **report generation, code history tracking, and advanced troubleshooting guides**.

Built with durability in mind, the Bosch KTS 550 features a **rugged, drop-resistant casing** and a **long-lasting battery**, ensuring reliability in demanding environments. The scanner s **user-friendly interface** includes **on-screen navigation menus, quick-access shortcuts, and a help function** that guides users through complex diagnostics with step-by-step instructions. Whether used by a professional mechanic for shop diagnostics or by an automotive enthusiast for DIY troubleshooting, the Bosch KTS 550 delivers **professional-grade accuracy and ease of use**. Its **affordable price point**, when compared to more expensive diagnostic systems, makes it an excellent investment for anyone seeking a **versatile, all-in-one diagnostic tool** that goes far beyond the limitations of basic OBD-II scanners. From **clearing check engine lights** to **deep-diving into complex engine management systems**, the Bosch KTS 550 is a reliable companion for anyone serious about vehicle diagnostics.

The Bosch KTS 550 (model number 5551777) is a popular OBD-II scanner designed for professional and DIY automotive diagnostics. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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1. **Comprehensive Diagnostic Capabilities**: The Bosch KTS 550 supports OBD-II, OBD-I, and some manufacturer-specific protocols (e.g., Bosch, Mercedes-Benz, BMW, VW, Audi, and others). This makes it versatile for diagnosing a wide range of vehicles, including European and some Asian models. It can read and clear trouble codes, retrieve live data streams, and perform basic system tests.

2. **User-Friendly Interface**: The device features a large, easy-to-read LCD screen with intuitive navigation menus. The on-screen prompts guide users through diagnostics, making it accessible for both beginners and professionals. The touchscreen is responsive, and the layout is clean and organized.

3. **Live Data Streaming**: The scanner provides real-time data for various engine parameters such as RPM, fuel trim, oxygen sensor readings, and more. This is useful for diagnosing intermittent issues or verifying repairs by monitoring system performance in real time.

4. **Code Retrieval and Clearing**: It can retrieve stored diagnostic trouble codes (DTCs) from the vehicle s ECU and clear them after repairs. The scanner also provides brief descriptions of the codes, which helps users understand the nature of the issue.

5. **Battery Test Function**: The Bosch KTS 550 includes a battery voltage test feature, allowing users to check the health of the vehicle s battery and alternator. This is a handy tool for diagnosing electrical system issues.

6. **Portable and Durable Design**: The device is compact and lightweight, making it easy to carry in a toolbox or vehicle. It is also built to withstand occasional drops and rough handling, though it is not waterproof.

7. **Affordable for Its Features**: Compared to more advanced diagnostic tools like scan tools with VCDS (VAG-COM) compatibility or professional-grade equipment, the Bosch KTS 550 offers a good balance of features and cost. It is often priced lower than similar multi-system scanners.

8. **Compatibility with Aftermarket Parts**: The scanner can help diagnose issues related to aftermarket parts, such as oxygen sensors, mass airflow sensors, or injectors, by comparing live data against manufacturer specifications.

9. **No Subscription Required**: Unlike some modern scan tools that require a subscription for full functionality or updates, the Bosch KTS 550 operates independently without any ongoing costs.

10. **Durable Build Quality**: The casing is sturdy, and the internal components appear to be well-built for long-term use, especially given its price point.

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1. **Limited Advanced Features**: While the Bosch KTS 550 is excellent for basic diagnostics, it lacks advanced features found in higher-end tools. For example, it does not support full VCDS (VAG-COM) functionality for VW, Audi, or Mercedes-Benz vehicles, which means users may need additional software or tools for these brands. It also does not perform adaptive learning resets, which are critical for some modern vehicles.

2. **No Wireless Connectivity**: The scanner relies on a wired connection to the vehicle s OBD-II port. There is no Bluetooth or Wi-Fi connectivity, which limits its usability for remote diagnostics or integration with smartphones or tablets.

3. **Outdated Software**: The firmware on the Bosch KTS 550 is not regularly updated, and it may not support the latest vehicle models or diagnostic protocols. This can be a limitation for diagnosing newer cars that rely on more advanced communication methods.

4. **No Graphical Data Logging**: Unlike some higher-end scanners, the Bosch KTS 550 does not allow users to log data over time or create graphs to analyze trends. This can be a drawback for diagnosing intermittent issues that require historical data.

5. **Limited Manufacturer-Specific Functions**: While the scanner supports some manufacturer-specific protocols, it does not provide the depth of diagnostics offered by tools like VCDS, INPA, or ISTA for brands like VW, Audi, or BMW. For these brands, users may need to invest in additional software or hardware.

6. **No Vehicle-Specific Guides**: The scanner does not include built-in vehicle-specific guides or repair tips. Users must rely on external resources (e.g., repair manuals, online forums) to interpret codes and diagnose issues fully.

7. **No Support for Hybrid/EV Diagnostics**: The Bosch KTS 550 does not support diagnostics for hybrid or electric vehicles (EVs), which are becoming increasingly common. This limits its usefulness for modern, eco-friendly vehicles.

8. **No USB or PC Connectivity**: The scanner does not connect to a computer for advanced diagnostics or data analysis. Users cannot export data to a PC for further review, which can be a limitation for professionals who need detailed records.

9. **Battery Life**: While the device is portable, it relies on its own battery, which may not last very long during extended use. Users may need to carry spare batteries or a charger.

10. **No Warranty on Replacement Parts**: The warranty on the Bosch KTS 550 typically covers the device itself but may not include replacement parts if the scanner malfunctions. This can be a concern for users who rely heavily on the tool.

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The Bosch KTS 550 (5551777) is a solid, budget-friendly OBD-II scanner that excels in basic diagnostics for a wide range of vehicles. It is particularly well-suited for DIY enthusiasts, mechanics working on non-European vehicles, or those who primarily deal with older or simpler vehicles. Its strengths lie in its ease of use, comprehensive code reading, live data streaming, and affordability. However, its limitations such as the lack of advanced features, wireless connectivity, and manufacturer-specific tools make it less ideal for professionals working on modern European vehicles or those requiring in-depth diagnostics.

For users who need a versatile, no-frills tool for general diagnostics, the Bosch KTS 550 is a practical choice. However, those working on high-end or complex vehicles may find it insufficient and may need to supplement it with additional tools or software.

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- You are a DIY mechanic or enthusiast looking for a reliable, affordable scanner for basic diagnostics on a variety of vehicles.

- You primarily work on non-European or older vehicles where OBD-II is sufficient.

- You value simplicity and ease of use without needing advanced features like VCDS or wireless connectivity.

- You are on a budget and want a tool that covers the basics without requiring additional investments.

- You work extensively on European vehicles (VW, Audi, BMW, Mercedes-Benz, etc.), as you may need additional tools like VCDS or INPA for full diagnostics.

- You require wireless connectivity, data logging, or advanced features like adaptive learning resets.

- You deal with hybrid or electric vehicles, as the Bosch KTS 550 does not support these.

- You need to connect the scanner to a PC for detailed analysis or record-keeping.

For those who want a more advanced tool, alternatives like the **Launch X431 Pro, Autel MaxiCOM K-Pro, or VCDS (for VW/Audi/BMW) with a compatible interface** may be worth the investment. However, if your needs align with the Bosch KTS 550 s capabilities, it remains a dependable and cost-effective choice.

Details:

The Bosch OBD2 Scanner is a diagnostic tool specifically designed for passenger vehicles with ABS systems. This scanner, with the manufacturer part number 5551777, provides OBD and OBDII interface capabilities, making it easy to identify fix issues your vehicle.

part #: 5551777 prices

• $33.98-$395.00

specifications codereadescanne:

• brand: Bosch
• mpn: 5551777
• supported system: Abs
• vehicle type: Passenger Vehicle
• obd interface: Obdii, Obd
• features: User Friendly

offer codereadescanne:

• quantity: 1
• sold: 0
• options: Ship-to-home
• availability: In Stock
• best offers: True
• started: February 18, 2026

general codereadescanne:

• Automotive Tools Supplies > Diagnostic Service Tools > Code Readers Scanners
• condition: Used

seller codereadescanne:

• rating: 0.0%
• city: Oklahoma City, Oklahoma
• # reviews: 0

payments codereadescanne:

• wallet: Google-pay
• credit card: Diners-club
• other

returns codereadescanne:

• policy: No Returns

shipping codereadescanne:

• transit: 5-10 Days
• service: USPS Ground Advantage
• carrier: USPS
• type: Calculated
• cost: $7.52
• class: Standard

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