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Hi, thank you for welcoming me and my 2.0 2000 beetle

612 Views 2 Replies 2 Participants Last post by  Liljay
I recently had my cel illuminate.

The codes

I've recently changed plugs, leads and coil

The P0303 code comes up twice as an active and a pending.

Any thoughts what's the problem
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http://wiki.ross-tech.com/wiki/index.php/16687/P0303/000771 (misfire cylinder #3)

P0134 Volkswagen - HO2S11 Sensor Circuit No Activity Detected (Bank1, Sensor 1; "upstream" before the catalyst 02 sensor)

Read more: P0134 Volkswagen HO2S11 Sensor Circuit No Activity Detected OBDII Engine Light Trouble Code | Engine-Codes.com

16500/P0116/000278 - Ross-Tech Wiki (coolant temp sensor; probably bad)

16555/P0171/000369 - Ross-Tech Wiki (maybe related to lack of activity from upstream 02 sensor error above)

What scan tool; do you have access to? Does it have live data capability? You might check the B1S1 upstream 02 sensor activity and see if it is working as it should? Checking the fuel trim levels; in real time, would be helpful as well.

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Hi thanks for your reply. The information you provided is excellent.

I have only got a cheap scan tool but it does do live readings so will check tomorrow and post back my findings.

Thanks for your help
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