Just wondered how much hassle is involved with knock sensor 3 and it’s location etc. Or is there something else that may cause the code
Knock sensor help please
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Human Joist
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Knock sensor help please
Afternoon all. There always seems to be things to keep us busy. VCDS threw this code today
For knock sensor 3. Cleared the code and drove it to work. Went so much quicker. Went to accelerate again and it almost coughed and the tone of the engine changed and it felt restricted again. Which I presume was the fault reappearing. Will confirm later by checking the code again.
Just wondered how much hassle is involved with knock sensor 3 and it’s location etc. Or is there something else that may cause the code
Just wondered how much hassle is involved with knock sensor 3 and it’s location etc. Or is there something else that may cause the code
Last edited by Human Joist on Fri Jun 12, 2020 3:10 pm, edited 1 time in total.
Re: Knock sensors.
Unfortunately I’ve no knowledge on the subject at all but I was wondering if the EML come on each time you guys plug the VCDS in or do you just plug it in every now and then to see how the cars performing and then find these issues by chance?
Sorry for the side track.
Sorry for the side track.
Re: Knock sensors.
Has to be the sensor or the wiring. Suppose it could be a duff ECU but it’s extremely unlikely.
I’d check the wiring first. Get hot in there and could make the wiring a bit fragile after lots of heat cycles.
I’d check the wiring first. Get hot in there and could make the wiring a bit fragile after lots of heat cycles.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Knock sensors.
Some faults put EML on, some don’t.ChrisA wrote: ↑Thu Jun 11, 2020 6:40 pmUnfortunately I’ve no knowledge on the subject at all but I was wondering if the EML come on each time you guys plug the VCDS in or do you just plug it in every now and then to see how the cars performing and then find these issues by chance?
Sorry for the side track.
Using VCDS you can check the state of the various modules of the car. It has no effect on the faults. Unless you want it to.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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Human Joist
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Re: Knock sensors.
Cheers mate. Will see if I can get in there tomorrow. Is it from the top or bottom. Any ideas how much hassle they are to change ?
I’ve got to strip the air box off to replace the spark plugs and fit new Apikol seals anyway. Just wondering if it’s worth swapping it out at the same time. Or if there is nothing obvious with the wiring
Re: Knock sensors.
2 of them are under the inlet manifold. The other one is down under the exhaust manifold on bank 5-8.
Check the green connectors that are mounted on the top of the inlet manifold first. I had to replace 2 of these connectors.
Check the green connectors that are mounted on the top of the inlet manifold first. I had to replace 2 of these connectors.
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Human Joist
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Re: Knock sensors.
Ok bud. Will do. It’s knock sensor 3 g198. So thinking this might be the odd one low down
But will check the plugs tomorrow morning and report back-
Human Joist
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- Posts: 487
- Joined: Sat Aug 02, 2014 6:04 pm
Re: Knock sensors.
The connectors look ok as does what I can see of the wiring. From what I have researched this is knock sensor 3
the wire from this disappears down the front of the inlet manifold out of sight.
My readings on them are
Looks like cylinders 7-8 are giving lower readings. Also 1-6 were fluctuating with the engine running. And 7-8 stationary.
Has anyone changed them or any advice for what needs removing to get to them. Looks like inlet manifold off and then accessible. But any help appreciated
My readings on them are
Has anyone changed them or any advice for what needs removing to get to them. Looks like inlet manifold off and then accessible. But any help appreciated
Re: Knock sensor help please
Yeah, 7 and 8 are checked by knock sensor 3 (G198).
You could check the connections at the knock sensor, but you'll have to get to it first and it's under the inlet manifold.
You could check the connections at the knock sensor, but you'll have to get to it first and it's under the inlet manifold.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Knock sensor help please
You could also try re-torquing it. They are very sensitive to tightening to torque, but if you're going to the trouble of getting at it you might as well just put a new sensor on.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Knock sensor help please
While you're in there you might as well replace the suction jet / non-return valve which has a tendency to expire causing all sorts of vacuum misery. Test the after-run coolant pump, too. If it's dead (they die discretely) you can replace that, too.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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Human Joist
- 3rd Gear
- Posts: 487
- Joined: Sat Aug 02, 2014 6:04 pm
Re: Knock sensor help please
My concern before starting this removal is where the sensors actually are. Is this the best way to get to them or does the wire lead down and make this better accessed from underneath.
Last edited by Human Joist on Fri Jun 12, 2020 3:48 pm, edited 1 time in total.
Re: Knock sensor help please
There's nothing fundamentally difficult, just lots of bits to remove and much faff. The throttle body can stay on, but the air combiner attached to it needs to come off, so you're going to have to put the lock carrier in service position. If you've got a timing belt due, now's a good time.
Then fuel rails, coolant hoses, vac hoses, etc.
Have you got the workshop manual?
Then fuel rails, coolant hoses, vac hoses, etc.
Have you got the workshop manual?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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Human Joist
- 3rd Gear
- Posts: 487
- Joined: Sat Aug 02, 2014 6:04 pm
Re: Knock sensor help please
Just done the cambelt with help from a mate as the most intricate part was beyond me
Re: Knock sensor help please
Try spraying the connectors with some contact cleaner. You never know.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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