# VW oxygen sensor?

**URL:** <https://community.cartalk.com/t/vw-oxygen-sensor/15558>\
**Category:** Maintenance/Repairs\
**Created:** [June 19, 2008, 1:45pm UTC](https://community.cartalk.com/t/vw-oxygen-sensor/15558 "2008-06-19T13:45:54Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![phlogiston](https://avatars.discourse-cdn.com/v4/letter/p/5fc32e/32.png) [@phlogiston](https://community.cartalk.com/u/phlogiston)\
**Post date:** [June 19, 2008, 1:45pm UTC](https://community.cartalk.com/t/vw-oxygen-sensor/15558/1 "2008-06-19T13:45:54Z")

</div>

Have a 97 Jetta 2 liter, 77K miles. The OBD code 140 (O2 circuit sensor2 bank1 no activity) has been kicking in and then going away from time to time for a couple of years. Now it seems to be on steady and is accompanied by 134 (sensor1 bank1 no activity) and 135 (sensor heater circuit heater sensor1 bank1 malfunction). Am I due for a new O2 sensor (it has never been replaced)? Car runs fine.

---

<div class="post-metadata">

**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\
**Post date:** [June 19, 2008, 1:50pm UTC](https://community.cartalk.com/t/vw-oxygen-sensor/15558/2 "2008-06-19T13:50:53Z")

</div>

You have a problem with the wiring, not the oxygen sensor itself. Check the wiring harness. You may find it melted to the exhaust, or some other obvious fault.