View Full Version : P0156 and P0161
c280_ep
08-17-2005, 09:10 AM
I got a check engine light on my 99 C280 so I pulled the code.
P0161, and P0156 code is pending.
P0161 is the O2 sensor (bank 2), I think. Anybody knows what a P0156 is? The program that I am using is calling a O2 heater circuit. Thanks for the help.
Denlasoul
08-17-2005, 10:12 AM
This may help. (http://202tech.mkosonen.com/howto/enginecodes2.html)
adelaros
08-17-2005, 11:03 AM
P0155 O2S 2 heater circuit malfunction Left O2S 2 (before TWC)
P0156 O2S 2 circuit malfunction Left O2S 2 (after TWC)
P0160 O2S 2 heater circuit malfunction Left O2S 2 heater(before TWC)
P0161 O2S 2 heater circuit malfunction Left O2S 2 (after TWC)
c280_ep
08-17-2005, 11:16 AM
what's the difference between the O2 heater circuit and the O2 circuit? Would changing the O2 sensor out fix the two codes or I have to change something else out?
jnenad16
08-17-2005, 11:57 AM
Originally posted by c280_ep
what's the difference between the O2 heater circuit and the O2 circuit? Would changing the O2 sensor out fix the two codes or I have to change something else out?
O2 heater is a built in component in the O2 sensors, replacing the sensor should remedy both problems, however, there are other sensors and relays controling the O2 heater as well, so check those out first.
nenad
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