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5500 km on a new Q5 TDI and have to replace a knock sensor

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Old 02-19-2014, 04:41 PM
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Default Re: 5500 km on a new Q5 TDI and have to replace a knock sensor

Originally Posted by spijun View Post
LOL "knock sensor but really means oxygen sensor"

Oxygen sensor (or lambda sensor) is not the same as Nitrogen oxide sensor or NOX sensor

Knock sensor works like a microphone listening for detonation (knocking). As the name implies, it senses knocks in the engine.............

Totally different sensors with different functions: Oxygen sensor, NOX sensor, Knock sensor
I know they are different. My theory is that the service writer doesn't know they are different.
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Old 02-27-2014, 10:03 AM
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Default Re: 5500 km on a new Q5 TDI and have to replace a knock sensor

As everyone suggested (and I suspected) it is a NOx sensor and not a knock sensor. In for replacement today and hopefully I get it back tonight.

They gave me an A4 with the 2.0T as a loaner... not a fan after getting used to the Q5 TDI.
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