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Precision Raceworks

Precision Raceworks BMW N54 Coolant/Expansion Tank Level Sensor Extension Harness Loom – E82 E88 E90 E91 E92 E93 E89 (135i 1M 335i Z4 35i) – Reservoir/Header Tank Switch Cable Extender – Plug & Play OEM Connectors – 335d Swap – Part 201-0050

Precision Raceworks BMW N54 Coolant/Expansion Tank Level Sensor Extension Harness Loom – E82 E88 E90 E91 E92 E93 E89 (135i 1M 335i Z4 35i) – Reservoir/Header Tank Switch Cable Extender – Plug & Play OEM Connectors – 335d Swap – Part 201-0050

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BMW N54 Expansion Tank Level Switch Lead Extender for E82 E88 E90 E91 E92 E93 E89 135i 1M 335i Z4 35i. Part No. 201-0050

Move your expansion tank with confidence and keep your dash warnings working exactly as BMW intended. This Precision Raceworks lead extender is a direct-fit wiring loom that lets you reposition the header tank on N54-powered E8X, E9X and E89 models without cutting or splicing. It uses factory-grade plugs for a clean, tidy, reversible install that looks OE and performs flawlessly.

Ideal when carrying out a 335d expansion tank swap on an N54, fitting relocated inlets or tidying a modified engine bay. If your original level switch cable will not reach after moving the reservoir, this is the simple plug-in answer that preserves your coolant level warning functionality.

Why enthusiasts choose this loom

  • Direct plug-in connectors that lock positively to the sensor and chassis harness
  • No wire cutting. No soldering. Fully reversible for an OE-style finish
  • Perfect length for expansion bottle relocation and 335d header tank conversions
  • Keeps the coolant level alert active after component moves
  • Built by Precision Raceworks for reliability in daily, fast-road and track use

Proven on our own cars

We run this extender on our in-house N54 projects and it has been faultless. Customers tell us it saves time, avoids wiring headaches and keeps the bay looking factory while supporting popular modifications.

Vehicle fitment

For BMW models with the N54 twin-turbo engine:

  • E82 1M
  • E82 and E88 135i
  • E90 E91 E92 E93 335i
  • E89 Z4 sDrive35i

Part details

  • Manufacturer: Precision Raceworks
  • Part number: 201-0050
  • Connection type: Factory-style plug-in connectors
  • Installation: Direct fit. No splicing required

Perfect for these jobs

  • 335d expansion tank conversion on N54 platforms
  • Relocated inlet and chargepipe setups where the reservoir is moved
  • Engine bay clean-ups that shorten or reroute the original sensor lead

Fitting and support

Professional installation available at MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Compatibility check

We can confirm suitability before dispatch. Add your UK registration or the last 7 digits of your VIN at checkout.

Search-friendly phrases

BMW N54 expansion bottle sensor cable. Header tank level switch loom extender. Coolant reservoir level plug lead for E82 E88 E90 E91 E92 E93 E89. 135i 335i 1M Z4 35i level sensor cable extension. 335d header tank conversion wiring for N54. OEM-grade plug connectors for coolant level float switch. Direct-fit reservoir sensor adapter harness. Precision Raceworks 201-0050.

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