So with some puzzling, logging, analyzing and reflection, I have noticed the followuing:Ģ: labeled Load - values range from about 10% at idle to values as high as 100% when driving around.ģ. When I go into OBD2 mode, oxygen sensor data are reported as 0 or 1 rather than a continuous value one would expect from a wideband oxygen sensor.Īfter a lot of Googling, it appeared to me that measuring groups 30-39 would probably relate to oxygen sensors and 40-49 to other aspects of emissions.
Unfortunately, I was not able to find documentation for the measuring groups most pertinent to this issue. Rather than just replace a rear oxygen sensor, I got out my VCDS to figure out what was going on.
Those errors, and the excessive soot buildup have apparently been corrected, but I now have recurrent P2271 (rear oxygen sensor rich) errors after driving about 60 miles on the highway. I recently had DPF and EGR cooler replaced because of excessive soot in the tailpipe and insufficient EGR flow rate errors. I might buy some second hand looms from eBay, overhaul them and fit them.I have a 2010 Jetta TDI with about 50,000 miles on the clock. I'm not too happy with the quality of the repairs but they'll do for now. I replaced the fuse and most of the system worked except the front passenger door therefore I re-checked the wiring and found a high resistance on one wire so made another repair. After all, there are a number of empty fuse locations for equipment that the car was never fitted with. Why, I don't know but I'd only checked for blown fuses and as the car hasn't had a working auxiliary heater for years and it doesn't have a sunroof I didn't think it being missing was any concern. However according to the manual and this link fuse 27 only powers the auxilary heater and the sunroof and does nothing for the central locking. Having bought a Haynes manual for the wiring diagrams I noticed the diagram showed fuse 27, 32 and 75 are related to the central locking.
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