mkim331

05 c240. I replaced the battery and did the oil change using moble one 0w40. Soon after CEL came on and read p0131, p0151. I reset the code by disconnecting the battery then CEL came off. Drove the car for two hrs on the hwy it seems fine so far. Whats wrong with it?
CEL will come back on again?
Otherwise whats the best bet?

Xhale707

OBD-II Description P0131 - Oxygen O2 Sensor Low Voltage (Bank1, Sensor2)
Causes

A code P0131 may mean that one or more of the following has happened:

• Faulty o2 oxygen sensor
• Short to voltage on O2 signal circuit
• High resistance or open on O2 signal circuit

Possible Solutions

• Replace faulty sensor
• Repair short, open, or high resistance on o2 signal circuit

OBD-II Description P0151 - Oxygen O2 Sensor Low Voltage (Bank2, Sensor1)

Causes

A code P0151 may mean that one or more of the following has happened:

• Faulty o2 oxygen sensor
• Short to voltage on O2 signal circuit
• High resistance or open on O2 signal circuit

Possible Solutions

• Replace faulty sensor
• Repair short, open, or high resistance on o2 signal circuit
  
  
  
  
  
  You disconnected the battery im sure it may have triggered these to go off.

mleskovar

Get an OBDII reader that can clear the codes, they're inexpensive and useful for any car.

Nothing, no codes, be happy.

Time will tell but my guess is no. If it does, verify it's the same code(s) again before troubleshooting.