Check Engine Light and 02 Sensor Codes

CLK_Couped
Wed, 20 Jan 2010 05:13:51 +0000
Maintenance/Repairs

Recently, the pesky check engine light appeared on my 2002 CLK 320. Took it to the mechanic, he scanned it and handed me a piece of paper with the following codes:

*P0135 (4) Left 02 Sensor (before cat) Open circuit in sensor heater line

*P1050 (4) Left 02 Sensor (before cat) Open circuit

He “cleared” the above codes and sent me on my way to “wait and watch.” It’s been one day and about 100 miles thus far, and no check engine light yet. I’ve noticed no change in performance or mileage. However, I’m just not comfortable with this “wait and watch” approach because I just had him put a pricey catalytic converter on one month ago.

Any ideas about what’s really going on with my ride and what I can do to prevent this from turning into a costly disaster? I understand this could be a number of things, so I would rather be proactive about this situation than reactive.

Thanks,

CLK Couped

7 posts - 3 participants