P0156
#1
P0156
Hey guys,
I have a 2000 Eddie Bauer Expidition with the 5.4. I ran my code reader and it popped up a P0156 code, meaning O2 sensor (bank 2 sensor 2). I am unsure which O2 sensor that is. How many O2 sensors on this beast (tried to decipher info on a search but with dial up it sucks) and would it be better to replace all of them? It has 75,000+ on it.
The gas mileage did drop about 4mpg and not running as smooth.
Thanks in advance.
Aaron
Nappers
I have a 2000 Eddie Bauer Expidition with the 5.4. I ran my code reader and it popped up a P0156 code, meaning O2 sensor (bank 2 sensor 2). I am unsure which O2 sensor that is. How many O2 sensors on this beast (tried to decipher info on a search but with dial up it sucks) and would it be better to replace all of them? It has 75,000+ on it.
The gas mileage did drop about 4mpg and not running as smooth.
Thanks in advance.
Aaron
Nappers
#2
#3
The P0156 won't cause poor gas mileage, (HO2S2 is not used for fuel control) but the code can result from other conditions that do cause poor fuel economy.
If you have a misfire, address it first. It can cause excess fuel to be collected in the cat and keep the downstream O2 sensor from switching.
Other possible causes of a P0156:
An exhaust leak before the downstream sensor
Fault in wiring harness
Faulty sensor
Faulty PCM
Check your emissions warranty, some of these components are covered by your Federal warranty which, depending on where you live, could be an 8/80.
Replacing all four sensors would be a waste of money.
Steve
If you have a misfire, address it first. It can cause excess fuel to be collected in the cat and keep the downstream O2 sensor from switching.
Other possible causes of a P0156:
An exhaust leak before the downstream sensor
Fault in wiring harness
Faulty sensor
Faulty PCM
Check your emissions warranty, some of these components are covered by your Federal warranty which, depending on where you live, could be an 8/80.
Replacing all four sensors would be a waste of money.
Steve
Last edited by projectSHO89; 12-23-2005 at 10:02 AM.
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