What does code P2195 mean on a Mercedes-Benz and is it safe to drive?
P2195: O2 Sensor Signal Stuck Lean (Bank 1, Sensor 1). Here’s what it means on your Mercedes-Benz, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
The upstream O2 sensor on bank 1 is reporting lean all the time. Could be sensor or a real lean condition.
Common causes for your Mercedes-Benz
- Faulty upstream O2 sensor
- Vacuum leak or fuel delivery problem
- Exhaust leak before sensor
Symptoms
- Check Engine Light
- Rough run, possible lean codes
Typical fixes
- Replace O2 sensor
- Fix vacuum/fuel issues
- Repair exhaust leak
Repair cost range
For a Mercedes-Benz, repairs for P2195 often fall between $80 and $400, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.