Majeed Posted June 28, 2011 Report Share Posted June 28, 2011 hi guys my lupo failed on emmissions today and the o2 sensor is to blame. So i wondered how many o2 sensors does my lupo 1.4 manual have ? and whilst I'm asking, i wondered if o2 sensors from a polo be the same and interchangeable? thanks Quote Link to comment Share on other sites More sharing options...
jamesb16 Posted June 28, 2011 Report Share Posted June 28, 2011 i think there are two1 is in the manifold and the other is along the exhaust system in the cat housing, the one in the cat can be unscrewed but i think the one in the manifold is welded inhope this helps Quote Link to comment Share on other sites More sharing options...
Majeed Posted June 29, 2011 Author Report Share Posted June 29, 2011 thanks ! Quote Link to comment Share on other sites More sharing options...
kabman Posted July 2, 2011 Report Share Posted July 2, 2011 If it's pre-2000 it'll have just one, located between the engine and the catalyst. If it's post-2000 it'll also have a second sensor located after the catalyst. Both screw in, they aren't welded. It will be the first sensor you will need to change if any. The second sensor is only used to monitor the efficiency of the catalyst and doesn't effect the fuelling of the engine.As for interchangability, it will depend if it's a 4-wire (heated narrow band) or 5-wire (wide band) sensor. Other than that, most sensors function the same way and only the plug and cable length differ. I've never checked but I would be surprised if all VAG models of equivalent model year and engine type/size didn't use the same sensor.FWIW my 1.4 Lupo is running happily with a Ford/NTK sensor (it was free) Quote Link to comment Share on other sites More sharing options...
nick123 Posted July 30, 2011 Report Share Posted July 30, 2011 Mine failed on emissions too, check the exhaust system on some ramps mine had a small hole in the centre at a join, fixed with a £3 tin of gungum sealant. If you have a hole it'll suck in fresh air from outside and skew the lambda results, because the emissions test is done with a sensor at the tailpipe, not plugged into the ecu. A new lambda sensor is about £50 and may not solve your problem. Quote Link to comment Share on other sites More sharing options...
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