karce

Hello everyone,

So I am driving a 2007 200 CDI and I experienced some strange issues. It all started few months ago when I kept getting random red battery symbol popping up on dashboard. Since it has not been changed since the day the car left factory I have replaced it with Energizer 77Ah battery. It all worked fine for few months - exact battery warning started to pop up again. I suspected it might be something with alternator, so I had it checked twice (even replaced voltage regulator). However, battery warning keeps popping up randomly. Battery voltage before ignition is around 12.7V, but as to engineering mode data sometimes it drops to 11.8V and sometimes keeps around 13.9V.

Also, I happen to have a cheap OBD reader and tried to monitor errors I receive:
P0135 - Powertrain (O2 Sensor Heater Circuit (Bank 1 Sensor 1)
P2243 - Powertrain (O2 Sensor Reference Voltage Circuit/ Open Bank 1 Sensor 1)
P23E2 - no luck finding out what it's related to
P22C6 - don't know what it's related to either.

First 2 errors pops up right after receiving red battery symbol on dashboard, last 2 appears right after clearing them.

My question is: can faulty O2 sensor (if it is faulty) generate these battery errors or should I search for a 'electrical leak' somewhere else?

Plutoe

Well they are heated therefore consume voltage, but not with the ignition off---grab a volt meter and check!!

karce

Since I am not that experienced, could you tell me more, how should I do it and what do I have to look out for?