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Offline robinson1509

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O2 sensor
« on: April 25, 2016, 07:16:15 PM »
Has anyone seen this before?   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. 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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« Last Edit: May 02, 2016, 08:14:25 PM by robinson1509 »

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Offline robinson1509

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Re: O2 sensor
« Reply #1 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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Re: O2 sensor
« Reply #2 on: November 08, 2017, 04:15:30 PM »
Did you have to replace the tensioner and the belt?

Andy Y.
Lakewood, CO
1999 Eurovan MV

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Offline robinson1509

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Re: O2 sensor
« Reply #3 on: November 24, 2017, 06:53:55 PM »
Did you have to replace the tensioner and the belt?
I replaced the belt.