Nissan 200SX Computer Engine Box for Sale

About the Nissan 200SX Computer Engine Box

The ECU is the brain of the S12's ECCS engine management: it reads the factory sensors and sets fuel injection, ignition timing, and idle speed, which on a carefully kept classic is the difference between a car that starts crisply and one that never feels right. This unit lives in a sealed metal case with an epoxy-coated circuit board, runs the factory 200SX calibration, and stores error codes readable through Nissan's built-in self-diagnostic mode, no special equipment beyond the procedure in the service manual.

Why 200SX Owners Replace the ECU

The live FAQ lists the symptoms: erratic idling, stalling, rough starts, and warning lights. On forty-year-old electronics the root causes are aging capacitors that leak onto the board, cracked solder joints from decades of heat cycling, and corrosion at the connector. When sensor checks and grounds come up clean, the ECU is the next suspect.

Things to Confirm Before Ordering

• Your engine code, CA20E, CA18ET turbo, or V6, since calibrations differ
• Manual or automatic transmission, which also splits the units
• The part number from your old ECU's label, the ground-truth match
• Stock or near-stock engine; per the live FAQ, heavily modified builds belong on a programmable ECU

What Is Included, What Is Not Included

Vehicle Compatibility

Fitment Assistance

Call (240) 301-0095 with your engine code, transmission, and a photo of the old ECU's label. We match the part number so the unit that arrives runs your car correctly on the first start.

Condition and Inspection

This is a used classic-era ECU, inspected before shipping:

• Connector pins checked straight, clean, and corrosion-free
• Board inspected for capacitor leakage and heat damage
• Case checked sealed and intact
• Donor part number documented and matched to your label
• Photos provided before purchase

Why Buy from Us

• Engine-code and transmission match on electronics that do not forgive guesses
• Board-level inspection against the capacitor failures that kill these units
• Honest scarcity: working S12 ECUs are finite and getting rarer
• Free shipping to all 50 states in anti-static packaging
• No core charge
• 15 day replacement warranty