Audi A3 - Engine starts badly | HELLA

Audi

A3

Model years 1997 to 2003

All engines

Engine starts badly

If a customer complains about the above error, this could be caused by the coolant temperature sensor and / or its connection cable to the engine control unit. The customer may also complain of poor engine running. Error codes 16500, 16501 and 16502 may be output when reading out the event memory. These indicate a functional fault in the coolant temperature sensor. In this case, proceed as follows:

- Disconnect the plug connection at the engine control unit and the coolant temperature sensor.

- Check the cable for continuity. The ohmic resistance must be less than 1 Ohm.

- Check the contact pins in the plug connections for corrosion and clean if necessary.

- Check the ground connections.

If no fault is identified, check that the temperature sensor itself is functioning. This can be done by measuring the resistance between PIN 1 and 3. Three following reference values apply:

20°C = 2250 - 2950 Ohm

60°C = 530 - 675 Ohm

90°C = 190 - 270 Ohm

Important safety note Technical information and practical tips have been compiled by HELLA in order to provide professional support to vehicle workshops in their day-to-day work. The information provided on this website is intended for use by suitably qualified personnel only. Reprinting, distribution, reproduction, exploitation in any form or disclosure of the contents of this document, even in part, is prohibited without our express, written approval and indication of the source. The schematic illustrations, pictures and descriptions serve only for the purposes of explanation and representation of the instructions and cannot be used as a basis for installation or assembly work. All rights reserved.

How helpful is this article for you?

Not helpful at all

Very helpful

Please tell us what you did not like.
Many thanks. But before you go.

Sign up for our free HELLA TECH WORLD newsletter to receive the latest technical videos, car repair advice, training course information, marketing campaign details and diagnostic tips.

Show additional information on our newsletter Hide additional information on our newsletter

Register for our free HELLA TECH WORLD newsletter to stay up-to-date with the latest technical videos, car repair advice, trainings, diagnostic tips and marketing campaigns.

Together we can get cars back on the road quickly!

Please note:
You will only be subscribed to the newsletter once you have clicked on the confirmation link in the notification e-mail you will receive shortly!

Data Protection | Unsubscribe

Please note:
You will only be subscribed to the newsletter once you have clicked on the confirmation link in the notification e-mail you will receive shortly!

Data Protection | Unsubscribe

Almost there!

All you need to do is confirm your sign up!
We've sent an e-mail to your email address.

Check your inbox and click on the confirmation link to start receiving HELLA TECH WORLD updates.

Wrong e-mail or no confirmation received?
Click here to enter it again.