CaveVan Forum

VW T4 "Eurovans" => VR6 Engine tech => Topic started by: robinson1509 on April 25, 2016, 07:16:15 pm

Title: O2 sensor
Post by: robinson1509 on April 25, 2016, 07:16:15 pm

Has anyone seen this before?(http://uploads.tapatalk-cdn.com/20160426/f53b217a7e547c2846a254d69ecb89ef.jpg)   It seems the voltages are completely beyond the realm of possible, but at the moment the spikes occur a p0300 shows up. And the spikes do not show up in the short term fuel but will show up in the temp, rpm, o2 voltage, throttle position and I assume the knock sensor reads it as a misfire. (http://uploads.tapatalk-cdn.com/20160426/1b4606a8988c956681c4f003e04d87c0.jpg)My vag computer died so I am tring to diagnose with my phone. I have spent a couple days methodically testing system components and changing parts. I need some fresh ideas. The only thing that I have found out of sorts is the b1s2 occasionally flat lines and the comes back to life after a few minutes. I will test the post cat.

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Title: Re: O2 sensor
Post by: robinson1509 on July 15, 2016, 07:43:37 pm

After connecting the vag com and hours of trouble shooting i found the problem was caused by a slipping serpentine belt.

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Title: Re: O2 sensor
Post by: krautwagen on November 08, 2017, 04:15:30 pm

Did you have to replace the tensioner and the belt?

Title: Re: O2 sensor
Post by: robinson1509 on November 24, 2017, 06:53:55 pm

Quote from: krautwagen on November 08, 2017, 04:15:30 pm

Did you have to replace the tensioner and the belt?

I replaced the belt.