Air and Fuel› Oxygen Sensors, Controllers and Components

Integrated Engineering

Flex Fuel Sensor Kit

$404.08

SKU: IEELCK2

Special Order
Special Order
Ships in 4–6 weeks
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$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

The Integrated Engineering IEELCK2 is a flex fuel sensor kit designed to convert your 3.0T or 2.9TT engine to flex fuel capability. This kit includes everything needed for installation and provides reliable, real-time ethanol content readings. It allows your vehicle to run on premium 91/93 octane up to E85 with a single tune.
Show original supplier description
The Integrated Engineering IEELCK2 TrueFlex Sensor Kit is engineered for Audi B9 S4, S5, RS5, RS4, and SQ5 models with 3.0T or 2.9TT engines. This plug-and-play kit enables your factory engine computer to read and transmit real-time ethanol content to an advanced TrueFlex tune, unlocking significant power potential when running fuels from premium 91/93 octane all the way up to E85. Installation is straightforward, with a step-by-step guide provided. Once installed and the TrueFlex tune is flashed via the PowerLink app, you can use any blend of gasoline and ethanol. The system allows you to monitor your ethanol content directly within the app, providing a seamless user experience. This kit requires the iE B9 3.0T or 2.9TT POWERlink Tuning Suite and the iE TrueFlex Sensor Harness Kit. For maximum power gains, an iE upgraded HPFP is also recommended. TrueFlex tuning is available for North American 2017-2024 B9/B9.5 S4, S5, RS5, RS4, and SQ5 models. However, TrueFlex tuning is not currently supported for Rest-of-world (ROW) ECUs (Europe, Asia, Australia, etc.) for S4, S5, and SQ5 models.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandIntegrated Engineering
Part NumberIEELCK2
CategoryAir and Fuel
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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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