Bosch MED17.5 – Commonly Failing Engine ECU

Do you have a TSI or TFSI VAG vehicle that won’t start and you can’t communicate with the engine ECU? Check if it’s fitted with a Bosch MED17.5 control module. These engine ECUs are a frequent point of failure for various popular models – thankfully, we can restore functionality to them in just 2-3 working days.

Shop Now – Bosch MED17.5 Rebuild

You’ll find these problematic control units wreaking havoc in 2005-2015 vehicles with 1.8L and 2.0L petrol engines. This includes the popular second-generation Audi A3 (2007-2013), the Mk2 TT (2007-2014) and the third-generation VW Scirocco (2008-2015).

When failure strikes, a range of issues soon materialise. For example, it’s common for the engine to misfire, cut out, and eventually refuse to start at all when the MED17.5 is defective. These performance issues are typically accompanied by an illuminated engine warning light and a complete loss of communication with the engine ECU.  

Thankfully though, we can resolve each of these symptoms for good with our comprehensive remanufacturing service for the Bosch MED17.5 – use this short test form to get started today.

Which vehicles are affected by the Bosch MED17.5 fault?
As mentioned, these engine control modules are fitted to numerous 2005-2015 petrol VAG models.

They’re a frequent point of failure for the 2007-2013 Audi A3, often resulting in no communication with the engine ECU. Find the MED17.5 fitted to models with both types of 1.8L TFSI petrol engine (BZB and CDAA) as well as the CCZA code 2.0L TFSI engine.

The 1.8L TFSI (CDAA) engine, capable of 158 bhp, is also used in the base-spec Mk2 TT (2007-2014), which unfortunately means the MED17.5 is a common cause of these vehicles not starting.

Audi’s problems with the Bosch MED17.5 don’t stop there either. These ECUs can also be found causing issues for third-generation A4 and first-generation A5 vehicles with 1.8L TFSI engines.

VAG’s MED17.5 issue is widespread, and it even affects multiple Volkswagen models too – such as the Scirocco and Passat, which usually won’t start once the ECU has malfunctioned. Find these ECUs in 2.0L TSI Scirocco models (CAWB) from 2008-2015 and Passat B6 (2005-2010) models with both 1.8L and 2.0L TSI engines.

Find a full list of affected vehicles below or browse our product catalogue to find your specific model.

How to resolve Bosch MED17.5 failure
These control modules fail due to frequent internal malfunctions which are often present in replacement units. So not only will sourcing a brand-new ECU cost you a fortune, but it risks leaving you in the very same position, with an Audi TT or VW Scirocco that won’t start. Worse still, you’ll have to recode a brand-new ECU to your vehicle at additional time and expense. 

Thankfully, we’ve got a much easier, and much more cost-effective solution – a comprehensive rebuild of your Bosch MED17.5.

Our Solution
We’re the experts at remanufacturing these control modules, and utilising our service couldn’t be any easier. Submit your details via this test form and we’ll collect your ECU from you, test it, rebuild it, and return it back to you.

We have access to an extensive range of state-of-the-art testing equipment, which allows us to analyse your ECU under realistic operating conditions. This enables us to identify the root cause of unit failure with a great amount of accuracy and efficiency.

Having thoroughly tested your control module, our expert technicians will then begin the remanufacturing process. Our team utilise the very latest remanufacturing equipment and use higher-than-OEM standard components to restore lasting functionality to your unit.

We’re thorough because we offer an unlimited-mileage lifetime warranty on all of our rebuilds, including the MED17.5. Our process even preserves all coding information and immobiliser integrity, which means you can just refit your rebuilt ECU as soon as you receive it back.

We do all of this in just 2-3 working days – get started today.

Common failure symptoms:

• Non-start
• No communication with the engine ECU
• Engine warning light on
• Misfires
• Engine cutting out

Common fault codes: 

• P0641 – Sensor Reference Voltage ‘A’ Circuit/Open
• P1545 – Throttle Valve Control System Malfunction
• P0121 – Throttle Position Sensor: Implausible Signal
• P0122 – Throttle Position Sensor: Low Input
• 01314 – Engine Control Module: No Communication

Test and rebuild:
We test all MED17.5 units using the very latest equipment and rebuild them with top-grade components to restore long-lasting functionality. 
 
Programming:
Your rebuilt MED17.5 will be plug-and-play when you receive it back from us, saving you further time and money.
 
Quality:
We're proud of our industry-leading 0.49% defect rate, which is a product of our robust quality assurance practices and our exceptional attention to detail.

Warranty:

Lifetime unlimited mileage*

How do I get my unit rebuilt?

To pay for the rebuild click the Shop Now link above, select your part number and click: Get yours rebuilt.

Print the payment/booking confirmation email.

Package the MED17.5 ECU inside a sturdy box with plenty of packaging material and make sure you include your confirmation email in the box.

Send us your package by tracked courier (the shipping instructions are on the confirmation email).

Once received we will test, rebuild and return your ECU with an unlimited mileage lifetime warranty. If your unit turns out not to be faulty then we will refund your payment less a small testing fee and return shipping.

What if I don’t want to pay up front?

This is not a problem, if you prefer this option then follow these steps:

Fill in and submit this test form.

Print the booking confirmation email.

Package the MED17.5 inside a sturdy box with plenty of packaging material and make sure you include your confirmation email in the box.

Send us your package by tracked courier (the shipping instructions are on the confirmation email).

Once received, we will test your control module and call to inform you of the outcome of testing. If your unit is faulty and you choose to go ahead with the rebuild, then we will take payment over the phone using a debit/credit card.

We will then rebuild your ECU and return it to you with an unlimited mileage warranty.

If you require further information regarding this Bosch MED17.5 ECU then please contact us.