9665050780 21586389-9A – how to choose the right ECU
We offer a used Valeo J34P ECU intended for Peugeot and Citroën with a petrol engine. The unit is checked before it is sent.
Diagnose first
Before you order an ECU, make sure it is really the cause. Typical symptoms of a faulty unit are:
- the engine does not start and the injectors are not controlled,
- no communication with the diagnostic tester,
- no power to the ECU despite good fuses,
- a fault after water ingress or a short circuit in the wiring.
Wiring, power supply or sensors can cause similar symptoms.
Numbers on the label
- PSA number: 9665050780
- Valeo number: 21586389-9A
- ECU type: Valeo J34P
How to check compatibility
The most reliable way is to compare labels. Your ECU should show the numbers 9665050780, 21586389-9A. This unit was used in selected versions of Peugeot and Citroën with a petrol engine, but the number decides compatibility, not the model or year. If in doubt, send us a photo of the label.
Preparation and fitting
- IMMO OFF – plug & play: the immobiliser is disabled, so after fitting the ECU needs no programming or pairing with the immobiliser.
- Free cloning: if you send us your ECU, we will transfer the data from it.
- Warranty: 6 months.
Looking for a number other than 9665050780? Browse the Peugeot and Citroën categories or the Valeo manufacturer page.
Questions and answers: 9665050780
Is 9665050780 a new ECU?
No. We sell a used unit that is tested before dispatch.
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Will 9665050780 work without programming?
Yes. The immobiliser is disabled (IMMO OFF), so after fitting the ECU needs no programming or pairing with the immobiliser.
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Can you transfer the data from my ECU to 9665050780?
Yes, free of charge. Just send us your current ECU.
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How can I check that 9665050780 will fit?
Look at the label on your ECU. It must show the numbers 9665050780, 21586389-9A – the car model and year are not enough.
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