Rover Lucas 4CU Engine ECU Repairs

Type: Lucas
Fits: Range Rover Classic / Rover SD1 / TVR 350i
Fuel: Petrol

Note: This ECU may also fit other models.

On this page: repairs to the Rover Lucas 4CU, which is a petrol engine ECU. Our engineers carry them out in the UK. An answer reaches you before your ECU does: the outcome of our tests comes first, alongside our quote. The repaired unit follows only if you authorise the work.

Where you know the Lucas number, look for it under your model below, beside what listings print. A number missing from those lists does not settle coverage. Our technical team establishes that by looking at your particular ECU, never by guessing.

Our hubs go wider by make: see Land Rover or Rover.

Lucas 4CU numbers listed by model

Headings here are models. Under one you will find Lucas numbers from sales listings, plus litres if the seller printed a size. A line like that reports a seller’s wording about a car. Only testing shows whether a fault sits in your ECU.

Range Rover Classic

Listings give a Range Rover Classic for PRC 4764 and PRC 7440.

• PRC 4764: 3.5 litres
• PRC 7440: 3.5 litres

Rover SD1

A Rover SD1 appears among the cars sellers give for PRC 9280. Our table lists 83986 A together with it.

• PRC 9280: 3.5 litres

TVR 350i

Listings for a TVR 350i bring up PRC 9280 as well.

• PRC 9280

First to reach you: test results and our quote

Post is how your ECU gets to us, owner or garage, UK-wide. It gets logged and checked by eye on arrival. Electrical tests come next, then diagnostics for the fault in question.

Those diagnostics may point to voltage regulators, injector drivers or dry joints. What applies depends on readings from the ECU itself.

Only then does the outcome reach you, our quote with it. Chargeable work starts only once you authorise.

Last to reach you: your own Lucas 4CU, repaired

Your authorisation puts the job with our engineers. They work on UK premises we run, with kit that belongs to us. Nothing gets outsourced, subcontracted or shipped overseas.

Rework of the failed component takes place under the microscope. The tools run under temperature control. Your ECU must then clear final testing for us to sign the repair off. Because the rework stays at that component, no replacement unit comes into it, and the ECU returned is yours.

Since the repair leaves your original coding alone, refitting needs no recoding, which makes for plug and play. Warranty: 24 months, for that repair alone, non-transferable.

Your Rover Lucas 4CU quote

A quote starts at this Repair Form.

Engine ECU Repairs and What We Repair cover other makes.

Below is our Rover Lucas 4CU parts table.

Common part numbers associated with this type of unit