Pulling codes on an older Ford is straightforward with the right tool. Here’s a general approach that can help:

1. Confirm OBD1: Many Ford, Lincoln, and Mercury models from the early 1980s to mid-1990s use OBD1.
2. Find the connector: The diagnostic plugs are usually under the hood near the fuse box or driver-side fender.
3. Use a compatible tool: Connect a Ford-compatible OBD1 code reader, or use an OBD1-to-16‑pin adapter with a scanner that supports Ford OBD1 protocols.
4. Key ON: Turn the ignition to ON (engine off) and follow the tool’s prompts. Some tests may require the engine running; follow on-screen guidance.
5. Record and interpret: Note the codes and use the tool’s built‑in library or service information to understand them.

Results can vary by model and year, so follow the instructions included with your tool.

Choosing a scanner for an OBD1-era Ford comes down to fit and features. Consider:

• Compatibility: Look for explicit Ford OBD1 support (often noted for early 1980s–mid‑1990s). Tools should include or work with the under‑hood Ford connectors.
• Connection style: Options include handheld readers, OBD1‑to‑16‑pin adapter cables for modern scanners, or USB/Bluetooth interfaces for app/PC use.
• Functions: Reading and clearing codes is common; live data on OBD1 is limited and varies by vehicle.
• Build details: Reinforced pins, a long cable, and clear instructions can make use easier.
• Language and support: Instructions in your preferred language and update/support availability are helpful.

You’ll find readers, adapters, and scan tools on Walmart. Match the tool’s vehicle coverage to your Ford’s year before purchasing.

Many OBD2‑only readers won’t communicate with OBD1 systems. If you want to try your existing scanner, you’ll generally need both:

• An adapter cable: A Ford OBD1 (under‑hood) to 16‑pin OBD2 adapter connects the vehicle to your scanner.
• OBD1 protocol support: Your scanner or app must explicitly support Ford’s OBD1 communications. Without that, an adapter alone won’t enable reading.

Steps can include connecting the adapter, turning the ignition to ON, and following your tool’s prompts. If your scanner doesn’t list Ford OBD1 coverage, a dedicated OBD1 code reader designed for older Fords is often a simpler option. Communication success may vary by model year and tool capability.

On many early ’90s Fords, the OBD1 diagnostic connectors are under the hood, not under the dash. You’ll typically find:

• Main connector: A rectangular plug mounted near the driver‑side fender, firewall, or fuse/relay box.
• Single test lead: A smaller companion connector nearby that some tools use during tests.

They may be labeled “EEC” or “DIAG.” A flashlight helps spot them, and the owner’s manual or a service guide can provide exact locations for your model. Allow the engine bay to cool before reaching in, and avoid moving belts or hot components while locating the ports.

In many cases, yes—after addressing the issue, OBD1 codes can be cleared using a compatible code reader:

1. Connect the tool: Hook up a Ford‑compatible OBD1 reader or supported scanner with the proper adapter.
2. Follow prompts: Use the tool’s erase/clear function after retrieving codes. Some vehicles may require the key ON or an additional procedure.

Some owners also clear codes by briefly disconnecting the battery, but this can reset radio presets and learned settings and may not be advisable for every vehicle. Check your owner’s manual or service information before trying that method. Tool‑based clearing is generally more controlled, and results can vary by year and system.