9661961280 21585785-4A – 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.
What you get
- IMMO OFF plug & play version – no programming and no immobiliser pairing after fitting.
- Free cloning of data from your ECU (once you send it to us).
- Warranty: 6 months.
Label details
- PSA number: 9661961280
- Valeo number: 21585785-4A
- ECU type: Valeo J34P
Compare them with the label on your own ECU.
Matching by part number
- Application: selected versions of Peugeot and Citroën with a petrol engine.
- Numbers to compare: 9661961280, 21585785-4A.
- Model and year do not decide compatibility – the label does.
- Not sure? Send us a photo of your ECU label.
Other part numbers are in the Peugeot and Citroën categories, and Valeo units are on the manufacturer page.
Questions and answers: 9661961280
Does ECU 9661961280 fit my car?
Compare the label of your ECU with the numbers 9661961280, 21585785-4A. If they match, the ECU fits – the car model alone does not decide this.
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Does ECU 9661961280 need programming?
No. It is an IMMO OFF plug & play version: the immobiliser is disabled, so no programming is needed after fitting.
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Is 9661961280 a new ECU?
No. We sell a used unit that is tested before dispatch.
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Does no communication always mean a faulty ECU?
Not always. The cause can be in the wiring, power supply or sensors – that is why a diagnosis before buying is worth doing.
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