oxygen sensor

Can anyone help me locate the oxygen sensors on a Mercedes vito w639? I have the engine diagnostic light on and heard this is the most common reason. Thanks in advance

Couple days ago check engine appeared for the first time, I read the codes using Autel AP200 and got: P013504 -an electrical fault exists in the heater for oxygen sensor 1 (cylinder bank 1). An internal fault exists. I've done lots of reading and in the meantime ordered another sensor (bosh)...

Hi I own a R107 SL450 from 1980 I want to replace the Lambda sensor but could not find exact match of O2 sensor. Original part nbr is A002 542 1218 or Bosch 0258001040. I could not find identical match but purchased new sensor that was supposed to be compatible (Bosch 0258001051) I now have...

Hello to all-- I thank you in advance for any assistance you may be able to provide. I was wondering where I can possibly buy a part online. Do you have any good recommendations? I live in Brazil and would need to get the part shipped here, most likely from the UK as the car is a European...