Siemens SID204 Dumps for Range Rover Sport, Discovery 3 and Jaguar XF 2.7 Diesel

A 2006 Range Rover Sport TDV6 arrives on a flatbed. No crank, no comms with the engine ECU on IDS, and when you pull the ECU cover off you find green corrosion on the connector pins. The label reads NNN501000, NNV505100. That’s a Siemens SID204, the same unit used across the Discovery 3, the Range Rover Sport and the Jaguar S-Type and XF with the 2.7 V6 diesel. It’s a well-made ECU let down by where Land Rover mounted it.

Why SID204s come to us

• Water. The Discovery 3 and Range Rover Sport ECU sits in the engine bay under a plastic lid and takes water on the connector side. Once the tracks corrode the ECU either loses comms or runs with random injector faults.
• Failed tuning writes. A remap over OBD that dropped out halfway leaves a unit that powers up but won’t talk.
• Second-hand replacement. A used ECU from a breaker starts fine on the bench but the car’s immobiliser (through the BCM on Land Rover, the instrument pack on Jaguar) won’t accept it.

The first two need an original dump. The third needs either an immo off file or a dealer-level pairing session, and the choice between those is the question we get most. Brand pages: Land Rover and Jaguar.

Questions from the workshop

Can I just fit a used SID204 and code it with IDS?

On Land Rover, IDS/SDD can run an engine ECU replacement routine, which writes the security link between BCM and ECU. It expects a new, unpaired ECU. A used unit already carries its old car’s data and the routine fails on most attempts. That’s where a virgin-state file would help, and when that isn’t available for a given software, immo off is the practical answer.

What does immo off change on this ECU?

The engine ECU stops checking the immobiliser handshake at start-up. The BCM still does everything else: key recognition, central locking, alarm, starter enable. So the car still needs its keys and its BCM. All you’ve removed is the dependency between BCM and this particular ECU. It’s a workable long-term fix for a swapped ECU, but tell the owner the engine ECU no longer participates in the immobiliser.

Does the original dump include the calibration and the immo area?

Our SID204 dumps are full bench reads: flash and the EEPROM area in one package. That’s why they’re listed as DUMP rather than as a tuning file. If your unit is corrupt, writing a full dump for the matching software number puts it back to stock. Then you still need to pair it, or use the immo off version.

Can I read it over OBD?

KESS V2 and KESS3 read the flash over OBD on most Land Rover and Jaguar 2.7D applications, and that’s enough for a remap. It is not enough for recovery or immo work because the OBD route doesn’t touch the immo data, and a corrupt ECU rarely answers on OBD anyway. For that you read it on the bench.

Bench reading

Take the ECU out, clean the connector with contact cleaner and a fibre pen, and check for broken tracks near the pins before spending time on it. Then use KTAG, FoxFlash, New Trasdata or KT200 with the SID204/SID206 bench harness. Read the full flash and EEPROM and keep both. If the reading tool shows a checksum warning or a blank block where the calibration should be, that’s the corrupt area and the original dump is the cure. The OBD, bench and boot guide covers the general order if you’re new to bench work.

Part numbers you’ll see

Land Rover uses NNN (hardware), NNV (software) and NNS/NNW numbers on the label. Jaguar uses its own XP numbers. The Siemens 5WS40 number is on both. Examples from the catalogue:

• RANGE ROVER SPORT SID204 NNN501000 NNV505100 NNS505540-4269 DUMP
• RANGEROVER SPORT SID204 5WS40278B NNN500750 NNV503163 DUMP
• RANGE ROVER SPORT SID204 5WS40278B-T NNS505510 DUMP
• RANGE ROVER SPORT SID204 NNW508500 NNV505640 DUMP
• RANGE ROVER SID204 5WS40405E NNV506650 DUMP
• JAGUAR XF SID204 5WS40535H-T XP240M2000000 DUMP

Match the 5WS40 hardware number first, then the NNV or XP software number. A file for 5WS40278B written into a 5WS40405E will not behave.

Browse the SID204 model page and the original file category, or send your bench read with a photo of the label via the request form and say whether you want stock or immo off. More Land Rover V8 and TDV8 units are on the Range Rover brand page.