wnycec

The following codes popped up:

P0156 - O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)
P0161 - O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
P0455 - EVAP Emission Control System Leak (Large)

Would you guys give me some insight as to how I would go about fixing the problems noted.

Thanks in advance for your help.

bs00clk

I don't have experience with these but a quick search turned up a bunch of posts that you should check out for quick info. Good luck.

wnycec

http://cgi.ebay.com/ebaymotors/Merce...m250246542632&

Anyone ever buy from this lister?

wnycec

These are the rear O2 sensors correct? Plan on swapping them out myself if anyone could confirm

Thanks!

ZEEK

thats the MAF sensor. O2 sensors are different looking and i dont think they are easy to change?

ratha67

+1 ...that's the MAF sensor (Mass Air Flow sensor/meter). If you need 02 sensors, you are looking for these.

http://cgi.ebay.com/ebaymotors/_Car-...3756.m20.l1116

These are usually cheaper because they don't have the harness (plug)... You would have to use your original harness from the 02 sensor you're replacing.

sfclk

I got a P0150 - O2 Sensor Circuit Malfunction (Bank 2 Sensor 1) from my reader.

It goes away after a few days/drive cycles.

Which is which?

https://www.autohausaz.com/search/pr...xygen%20Sensor

wnycec

Confused everyone on my question - i mean P0156 and p0161 are the rear o2 sensors right?

blisscafe

i went to the stealship and told them my codes for the o2 sensor. they told me which ones then i went online and baught em. sorry it was a long time ago so i forget which codes i had

sfclk

http://catalog.worldpac.com/mercedes...=Oxygen+Sensor

there's the 4 sensors for a 99, just don't know which is which still.

bank 1 is probably the front sensors.

someone here must know for sure.

BilOutkast

I'm not sure which is which but I had P0156 and p0161 codes.
Bought a can of MAF cleaner at PepBoys. Car runs stronger than
it did before after using the cleaner, even used it on the ML320
and the idle shakes are now gone.

wnycec

P0156 - O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)
P0161 - O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)

Whats the differences between these two codes... Trying to get this resolved and after further investigation I noticed the detail of the two codes was different.

wnycec

Can anyone confirm that I need 15094 and 15092 to resolve the codes I am getting (P0156 & P0161)...

http://www.autohausaz.com/search/pro...xygen%20Sensor

Thanks in advance

batman6

i'm also getting the same codes I got po150,po156,po130,po136


can anyone tell me what i need to replace or do to fix it? thanks

wnycec

Looks like you need all four oxygen sensors replaced.

autohausaz.com is where I picked mine up from. You need the two 02 sensors before the cat and the 2 after the cat. That should clear up your problems. Easy fix if you could easily get under ur car and you just follow what you take out and reinstall the new ones just like the old ones.

unlukky

I cannot imagine that all 4 O2 sensors went bad at the same time. Or, for that matter, that both primary CATs failed at the same time. For this, I would go with cleaning and or replacing MAF. My 2 cents.

batman6

thanks guys i will try this and report back.