Add OBD2 to Older Car: A Comprehensive Guide

Adding OBD2 to an older car can seem like a daunting task, but with the right information and a little guidance, it’s a feasible upgrade for many car enthusiasts. This article provides a comprehensive look at the process, benefits, and considerations involved in retrofitting your classic car with OBD2 functionality.

Understanding OBD2 and its Benefits

Before diving into the how-to, it’s crucial to grasp the fundamentals of OBD2. On-Board Diagnostics, second generation (OBD2), is a standardized system implemented in vehicles manufactured after 1996 (in the US) to monitor and report engine and emissions-related data.

Why would you want to add OBD2 to an older car?

The advantages are multifold:

Enhanced Diagnostics: OBD2 grants access to a wealth of diagnostic information, allowing you to pinpoint issues with greater accuracy and speed. This can be a godsend for troubleshooting those head-scratching problems that older cars sometimes present.
Improved Repair Experience: With detailed diagnostic codes, you can streamline your interactions with mechanics, saving time and potentially reducing unnecessary repairs.
Proactive Maintenance: Real-time data from OBD2 lets you stay ahead of potential issues, facilitating preventative maintenance and potentially extending the life of your vehicle.
Performance Tuning: Enthusiasts often utilize OBD2 scanners to monitor and tweak engine parameters, optimizing performance and fuel efficiency.

OBD2 Scanner Connected to Car

Is Your Car Eligible for OBD2 Retrofit?

Not all older cars are created equal when it comes to OBD2 compatibility. Here’s a breakdown:

Pre-1996 Vehicles (US): Generally, cars manufactured before 1996 in the US didn’t come equipped with OBD2. However, the possibility of retrofitting depends on several factors like engine type and the availability of compatible electronic control units (ECUs).
OBD1 Vehicles: Cars from the late 80s and early 90s might have a precursor system called OBD1. Upgrading from OBD1 to OBD2 is often more straightforward than starting from scratch.

How do you determine your car’s compatibility?

Check Your Owner’s Manual: Look for any information about your car’s diagnostic system.
Consult Online Forums: Connect with fellow car enthusiasts and seek guidance from those who have attempted similar retrofits on the same make and model.
Seek Professional Advice: A trusted mechanic specializing in your car’s brand can provide invaluable insight into feasibility and potential challenges.

Methods to Add OBD2 to Your Older Car

If you’ve determined your car is a suitable candidate for an OBD2 retrofit, there are generally two primary approaches:

1. ECU Swap and Wiring Harness Modification

This method involves replacing your existing ECU with a compatible OBD2-compliant unit. Often, this also requires modifying the wiring harness to accommodate the new ECU and the OBD2 diagnostic port.

Pros:

Comprehensive OBD2 functionality.
Access to a wider range of diagnostic data and features.

Cons:

More complex installation, often requiring professional expertise.
Higher cost due to ECU and labor expenses.
Potential compatibility issues with your car’s other systems.

2. OBD2 Simulator Devices

Several aftermarket OBD2 simulator devices are designed to interface with older car systems. These devices essentially translate data from your car’s sensors into a format that an OBD2 scanner can read.

Pros:

Easier installation compared to ECU swaps.
More affordable than the ECU replacement route.
Generally, less invasive to your car’s original systems.

Cons:

Might not provide the full range of OBD2 data and functionalities.
Compatibility can vary depending on the device and your car’s specific setup.

OBD2 Simulator Installation

Choosing the Right OBD2 Scanner

Once you’ve successfully added OBD2 to your older car, selecting the right scanner is paramount:

Basic Code Readers: These entry-level scanners primarily retrieve and clear diagnostic trouble codes (DTCs), offering a starting point for troubleshooting.
Advanced Scanners: These provide a broader range of data points, including live sensor readings, allowing for more in-depth diagnostics and performance monitoring.
Professional-Grade Scanners: Mechanics and advanced DIYers utilize these high-end tools for comprehensive diagnostics, programming, and advanced functionalities.

For a list of highly-rated OBD2 scanners tailored to different needs and budgets, check out our top 10 OBD2 scanners 2018.

DIY vs. Professional Installation

The decision to tackle the OBD2 retrofit yourself or enlist a professional hinges on your comfort level, skills, and the chosen method.

ECU swaps and wiring modifications: Due to their complexity, these are best left to experienced mechanics, especially if you lack experience with automotive electronics.
OBD2 simulators: Depending on the device and your car’s setup, some simulators might be manageable for DIY installation. However, always consult the device’s instructions and proceed cautiously.

Conclusion

Adding OBD2 to an older car can be a rewarding endeavor for those who seek enhanced diagnostics, improved maintenance, or even performance tuning. While the process can range from straightforward to complex depending on your car and chosen method, the benefits can significantly outweigh the challenges.

Remember to carefully research your car’s compatibility, select the appropriate retrofitting method, and choose an OBD2 scanner that aligns with your needs. With careful planning and execution, you can bridge the technological gap and enjoy the advantages of OBD2 in your classic ride.

Frequently Asked Questions

1. Can I add OBD2 to any car?

Not all cars are compatible. Pre-1996 vehicles (in the US) require careful assessment, while OBD1 vehicles offer more straightforward upgrade paths.

2. How much does it cost to add OBD2 to an older car?

The cost varies widely based on the chosen method, car model, and labor costs. OBD2 simulator devices are generally more affordable than ECU swaps.

3. What are the risks of adding OBD2 to an older car?

Potential risks include compatibility issues, wiring errors if not done correctly, and voiding your car’s warranty (if applicable).

4. What are some reputable brands of OBD2 scanners?

Reputable brands include BlueDriver, FIXD, Ancel, and Inonitor, among others. Consult our top 10 OBD2 scanners 2018 for a comprehensive list.

5. Do I need any special skills to install an OBD2 simulator?

Basic automotive knowledge is helpful, but always refer to the device’s instructions. If unsure, consult a professional mechanic.

Need more help? Feel free to contact us via WhatsApp: +1(641)206-8880, Email: [email protected]. Our customer support team is available 24/7 to assist you. We also have a wide range of articles covering various aspects of OBD2 and car diagnostics.