13 replies to this topic

[Dylan720]

Hi all just wondering what is the easiest way to removoe and replace the knock sensor on a 2002 b4 twin turbo. Ive had a look and theres not much room to reach it just wondering what needs to be removed in order to remove the knock sensor. Any help would be great thanks.

[Jimbo]

Its pretty much near on impossible to remove it without taking the intake manifold off. Its a royal pain in the ass but its the only way to get to it.

Be VERY careful taking the manifold off as the plastic breather pipes coming off the intake tract can be very brittle and break. Make sure the spring clamps are slid off and remove the pipes very carefully.

[Dylan720]

Ok thanks for the reply i hope it is the knock sensor causeing the issue im having ill just be driving along and the engine light comes on then iy still rubs fine until i try to boost it and it wont but when i turn the engine off and start it again the lights off until i drive a few ks down the rd

[Jimbo]

Have you checked the codes on the ECU?

[Dylan720]

Its very difficult ive had it at a my mechanics but because it only comes on randomly he hasent had the chance to check it but he said its probably the knock sensor

[migoreng]

Plug thr black read connectors together under the steerimg column and turn the key to ON only, don't start.

Any long and short flashes?

[Dylan720]

Cause it only comes on sometimes after driving does that matter do i need to do it when it comes on so drive it till it comes o then connect them or can i do it even if it isn't on

[migoreng]

Just connect now and turn key to ON, don't start engine. We're seeing if any codes are stored.

[Dylan720]

No codes have been stored i took it to my mechanic also ti double check no codes are getting stored

[migoreng]

No idea then. My B4 flashes the CEL constantly when I use the black test connectors (No stored codes). Everything running fine since 170,000 til 290,000km.


How's the maintenance of your engine?
Used upper engine cleaner? Fuel additive?
Cleaned MAF sensor? Air filter?

[Dylan720]

The car has 170k on it its been very well looled after i braught it not to long ago it has 22 grand of receipts most of them are services from mrt i havent personly cleaned the maf sensor or airfilter or done upper engime cleaner yet im waiting for my air filter amd upper emgine cleaner to be delivered whats the best method to clean the maf sensor

[duncanm]

services from mrt

 

this isn't the 'mechanic' you speak of now, is it ?

[Dylan720]

Ive never taken it to mrt myself but the guy i baught it off did and it has 22 grand worth of receipts

[Dylan720]

The other issue is to when i have the ac fan speed on full the engine misses and the engine light flashes on amd off if its on any other speed its fine and the lights off im not sure if the knock sensor or 02 sensor or any sensor can cause it but i cant seem to find anything about it