What Hondas have OBD1?
In brief, most Honda and Acura models sold in the United States with model years roughly 1988 through 1991 used OBD1. By the mid-1990s, the U.S. market largely moved to OBD2. This article explains which Hondas commonly used OBD1, how to identify them, and regional variations.
OBD1 vs OBD2: A quick primer
OBD1 and OBD2 are two generations of on-board diagnostics with different connector styles and data capabilities. OBD1 was manufacturer-specific and year/market dependent, while OBD2 uses a standardized 16-pin diagnostic connector and a unified data protocol. In the United States, OBD2 became the standard for new cars starting with the 1996 model year, but many late 1980s to early 1990s Hondas relied on OBD1 technology.
Hondas commonly equipped with OBD1 in the U.S. market
Below is an indicative list of Honda/Acura nameplates that used OBD1 in the United States during the late 1980s to early 1990s. Actual year cutoffs can vary by model and region.
- Honda Civic (1988–1991)
- Honda CRX (1988–1991)
- Honda Accord (1988–1991)
- Honda Prelude (1988–1991)
- Acura Integra (US market; roughly 1990–1993)
These examples reflect the core lineup commonly associated with OBD1 in the U.S. market. Some other Honda-branded models and regional editions used OBD1 into the early 1990s, but broader adoption of OBD2 began in the mid-1990s for new models and markets.
How to identify an OBD1 Honda
Detecting the diagnostic system and port
OBD1 systems used manufacturer-specific diagnostic ports rather than the standardized 16-pin OBD-II connector. If your vehicle predates the U.S. switch to OBD2 (roughly late 1990s for many models), it likely uses OBD1. Look for clues such as an ECU label that mentions OBD-I or a nonstandard diagnostic connector located in the engine bay or near the firewall. By contrast, the familiar 16-pin OBD-II port under the driver’s dash is a strong sign of OBD2.
To be certain, check the vehicle’s service manual, the ECU sticker, or consult a mechanic who specializes in Honda diagnostics. Regional differences mean some markets used variations of OBD1 even as others moved to OBD2 earlier or later.
Summary
OBD1 represents the diagnostic standard used on many late-1980s to early-1990s Hondas in the U.S. and some other markets. The transition to OBD2 began in the mid-1990s, with the 16-pin standardized connector becoming common thereafter. If you own a Honda from this era and need to confirm the system, check the model year, examine the diagnostic port, and consult the official manuals or a knowledgeable technician.
Further notes
For enthusiasts restoring or modifying these early Hondas, documentation and community guides from model-specific clubs and archives are invaluable. Always verify with your specific VIN and local market regulations, as implementations did vary by year and region.
Does a 1998 Honda Civic have OBD2?
Side and just at the center console. If we move around. We can see it just in there bit hidden tucked away there it is so Honda Civic um 1998 model diagnostic plug location.
What year do cars use OBD1?
Cars with OBD1 are generally 1995 and older vehicles, although some 1994 and 1995 models might have been transitional and have OBD2. All cars sold in the United States from the 1996 model year onward are required to use the standardized OBD2 system.
How to tell if your car has OBD1
- Check the model year: If your car is from 1995 or earlier, it is likely OBD1.
- Look under the dashboard: OBD1 ports have different connectors depending on the manufacturer, and are often located under the dashboard, sometimes behind a fuse panel cover.
- Consult your vehicle's manual: The owner's manual should provide information on your car's diagnostic system.
- Use a compatible scan tool: Since OBD1 systems were not standardized, you will need a scan tool that is specifically designed to read the different protocols used by various car manufacturers. Many modern scan tools are compatible with both OBD1 and OBD2 systems.
What cars have OBD1?
OBD stands for On-board diagnostics. The two main types of diagnostic systems in vehicles is OBD1 and OBD2. OBD1 was used in vehicles up to as late as 2006 and anything newer will be OBD2. Some vehicles manufactured earlier than 2006 are still OBD2 For example: You own a 2003 Toyota Corolla, this is OBD1.
What year civic is OBD1?
Honda Civic OBD-I (92-95)
