Information FSI NOx Sensor, Polo 1.4 FSI v A2 FSI.

PlasticMac

PlasticMac

Admin Team
United-Kingdom
The NOx Sensor for the A2 FSI engine is NLA.
The Polo 1.4 FSI has a similar sensor, which although NLA, seems to have better availability, and a lower price.
Has anyone used the Polo part? I'm sure I read on here that someone had, and apart from lengthening the lead worked correctly.
The Polo version: NGK (NTK) Nox Sensor : 97668 NOX SENSOR NZA04-V2.
Mac.
 
Mac I hae replaced mine with an ngk one. I posted it on here at some point. You can wait for a bargain on black friday from autodoc! I got it as an ebay special brand new for 65 quid if memory serves me right!
 
Evripidis said:
Mac I hae replaced mine with an ngk one. I posted it on here at some point. You can wait for a bargain on black friday from autodoc! I got it as an ebay special brand new for 65 quid if memory serves me right!
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Bless me, that's a good price.
NGK don't make them anymore, but there must be a few tucked away.
Mac.
 
PlasticMac said:
They are very similar, but I have no idea on parts compatibility.
I'd think many parts are functionally the same, but maybe not mechanically compatible.
Mac.
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I think the BAD code ones in the mk4 golfs are the same for all intents and purposes, but the more common 1.6 FSI engines with timing chains like in the mk5 golf and A3 are quite a different engine.
 
I've been asking the same question for ages because I need an engine for the 1.6

The intake and egr orientation are different but that is just about all I could guess from pictures online.
 
Indi said:
I think the BAD code ones in the mk4 golfs are the same for all intents and purposes, but the more common 1.6 FSI engines with timing chains like in the mk5 golf and A3 are quite a different engine.
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According to the FSI engine SSP, the Polo 1.4 has a different, Siemens, ECU. Not sure if that's correct though. I think all the 1.6 have the same Bosch Motronic ECU, so, functionally, I'd expect the sensors to be the same, just fitting, cable length etc.
Mac.
 
Indi said:
I think the BAD code ones in the mk4 golfs are the same for all intents and purposes, but the more common 1.6 FSI engines with timing chains like in the mk5 golf and A3 are quite a different engine.
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Are the engines with timing chains FSI/BAD, or the later TFSI?
I had thought all BADs were belt. Not sure though.
Mac.
 
The BAD Engine Code is listed as used on the A2, Bora, and Golf. A version with 115 bhp, code BAG, was used on the A3.
Couldn't find any FSIs on Seat or Skoda.
They all seem to be belt cam.
Lists attached.
Mac.
 

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PlasticMac said:
Are the engines with timing chains FSI/BAD, or the later TFSI?
I had thought all BADs were belt. Not sure though.
Mac.
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Neither, they are still naturally aspirated 1.6 FSI engines, so the cars still have the 1.6 FSI lettering on the boot, but they are not the BAD engine code. Same block I’d imagine though
 
PlasticMac said:
The BAD Engine Code is listed as used on the A2, Bora, and Golf. A version with 115 bhp, code BAG, was used on the A3.
Couldn't find any FSIs on Seat or Skoda.
They all seem to be belt cam.
Lists attached.
Mac.
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Yeah the timing on the BAG 1.6 FSI engines is chain driven I believe.
It was the ‘next generation’. BAD was used in MK4 golfs, boras and A2s, and then BAG was used in MK5 golfs, A3, etc
 
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Indi said:
Yeah the timing on the BAG 1.6 FSI engines is chain driven I believe.
It was the ‘next generation’. BAD was used in MK4 golfs, boras and A2s, and then BAG was used in MK5 golfs, A3, etc
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Did the BAG have the same variable inlet flap "technology" or just the variable and injection pattern? Wouldn't be surprised.
Mac.
 
PlasticMac said:
Did the BAG have the same variable inlet flap "technology" or just the variable and injection pattern? Wouldn't be surprised.
Mac.
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Has the inlet manifold flaps I believe (SSP 296)
Has the dual thermostat system same as the BAD engines too

There’s also a bunch of other codes that also seem to be the newer chain driven ones; BLF, BLN, BLP, BKG
 
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So, the only engines with the possibility of cross compatibility need to be code BAD?
@Evripidis what are your thoughts on sensor cross compatibility? I think you've found some ancilliaries, hoses etc, are different.
Mac.
 
PlasticMac said:
So, the only engines with the possibility of cross compatibility need to be code BAD?
@Evripidis what are your thoughts on sensor cross compatibility? I think you've found some ancilliaries, hoses etc, are different.
Mac.
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Sensor cross compatibility is likely to go beyond just BAD engines I would think, but if the part numbers are not the same then the only way would be to try it and see.

Possibly cross compatibility goes further too, this lower intake manifold from a BLF engine out of a 2006 A3 looks very similar to the the one on the BAD engines, but I suspect the only way to find out for sure would be to buy one and try fitting it.

Generally there’s a fair amount of cross compatibility in the VAG lineup, as demonstrated by @celsisone

Each new engine code is an iteration rather than a total overhaul, so many parts will remain the same, or only undergo slight changes
 
@PlasticMac I've been doing in-depth searches online from time to time but all I can remember now is the EGR and throttle body.

I think some bits off the intake manifold but I am not certain. Someone, somewhere mentioned that at some point 1.6 fsi were upfitted with a chain and maybe some differences in the HPFP area but nothing solid. I tried finding one local but running or non-running the price was extrortionate so I deserted that idea. The only way of finding out I guess.

As far as the nox sensors go I would assume that they could carry over from one engine to the next. Again, for their price, used or new, you wouldn't take the bet!
 
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