C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

CEL ON

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Old Nov 20, 2010 | 09:10 AM
  #1  
mkim331's Avatar
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05 C240
CEL ON

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?
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Old Nov 20, 2010 | 10:59 AM
  #2  
Xhale707's Avatar
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From: North San diego
C320 2002
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.
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Old Nov 20, 2010 | 12:12 PM
  #3  
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'17 Jaguar XF
Originally Posted by mkim331
... I reset the code by disconnecting the battery then CEL came off....
Get an OBDII reader that can clear the codes, they're inexpensive and useful for any car.

Originally Posted by mkim331
..Drove the car for two hrs on the hwy it seems fine so far. Whats wrong with it?...
Nothing, no codes, be happy.

Originally Posted by mkim331
...CEL will come back on again?...
Time will tell but my guess is no. If it does, verify it's the same code(s) again before troubleshooting.
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