Mk5 jetta 2.0t O2 sensor

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barry23831
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Posts: 2

Mk5 jetta 2.0t O2 sensor Oct 28, 2019 17:09:18 GMT via mobile

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Post by barry23831 on Oct 28, 2019 17:09:18 GMT

Is there an adaptation for o2 oxygen sensor?

I was getting a P0420 catalyst system Bank One lower limit not reached I poked around and looked at lambdas and the numbers were not moving hardly at all on bank 1 sensor 1 so I did my research and figured I needed a new O2 sensor (upstream) pre cat. Got the new sensor installed it, the numbers are moving now but I got the same error PO420. I have cleared codes, unhooked the battery , even attempted a readiness. Still getting same code PO420.
Lambda numbers on sensor 2 (downstream) seem to be moving very well.

Matthew
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Posts: 860

Mk5 jetta 2.0t O2 sensor Nov 2, 2019 21:39:15 GMT

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Post by Matthew on Nov 2, 2019 21:39:15 GMT

Oct 28, 2019 17:09:18 GMT barry23831 said:

the numbers are moving now but I got the same error PO420

The values have to fluctuate within a valid range. Do they fluctuate in the same direction by about the same amount? Any significant deviation will result in the code.

At operating temperature (engine ON and idling after being driven), do both sensors show a reading of about ~1.0? (0.9 and 1.1 is acceptable as well)

Note: there is no calibration for your sensors. You can only fool the ECU if you had an aftermarket tune.

2008 MK5 VW Golf GTI

barry23831
New Member

Posts: 2

Mk5 jetta 2.0t O2 sensor Nov 11, 2019 2:43:46 GMT via mobile

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Post by barry23831 on Nov 11, 2019 2:43:46 GMT

Car has no tune, completely stock. New bosch VW genuine o2 sensor (pre cat).
Bank 1 sensor 1 was hardly moving before replacement.

This is a live data capture driving down the road.

www.dropbox.com/s/633nwmn5v1ylw3e/20191110_204218.mp4?dl=0

Matthew Moderator Posts: 860	Mk5 jetta 2.0t O2 sensor Nov 11, 2019 21:39:47 GMT Quote Select Post Deselect Post Link to Post Back to Top Post by Matthew on Nov 11, 2019 21:39:47 GMT Bank 1, sensor one went to 1.99 at some point. This should trigger a fault code.
	2008 MK5 VW Golf GTI

ben777
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Posts: 10

Mk5 jetta 2.0t O2 sensor Nov 22, 2019 10:23:18 GMT via mobile

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Post by ben777 on Nov 22, 2019 10:23:18 GMT

Nov 11, 2019 21:39:47 GMT Matthew said:

Bank 1, sensor one went to 1.99 at some point. This should trigger a fault code.

For the oxygen sensor on the vw jetta mk5, the voltage goes from 0 to 5 volts and this is normal, since there is a wide range sensor. If the sensor is not a wide range, then its voltage is normal from 0 to 1 volt.

Matthew
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Posts: 860

Mk5 jetta 2.0t O2 sensor Nov 22, 2019 13:55:18 GMT

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Post by Matthew on Nov 22, 2019 13:55:18 GMT

I know the MK5 uses a wideband. However, my point still remains that what you are seeing a high lambda reading which corresponds to an AFR of 29.253:1. That's not the voltage you are looking at. This to me indicates that your car is slow in keeping the lambda near stoichiometry for a yet to determined reason. My GTI never hits that even during an abnormal downshift.

Last Edit: Nov 22, 2019 13:56:21 GMT by Matthew

2008 MK5 VW Golf GTI

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Mk5 jetta 2.0t O2 sensor

Post by barry23831 on Oct 28, 2019 17:09:18 GMT

Post by Matthew on Nov 2, 2019 21:39:15 GMT

Post by barry23831 on Nov 11, 2019 2:43:46 GMT

Post by Matthew on Nov 11, 2019 21:39:47 GMT

Post by ben777 on Nov 22, 2019 10:23:18 GMT

Post by Matthew on Nov 22, 2019 13:55:18 GMT

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