Question about Cars & Trucks
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Posted on Jan 02, 2017
SOURCE: o2 sensor location
DTC P0156 indicates the output voltage of the downstream Heated Oxygen Sensor (HO2S) is less than some calibratable functional window.
The possible causes are:
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Posted on Apr 16, 2009
U don't say codes but most likely the sensor codes are just responding to a problem in the engine, mainly and most common is a lean fuel/air mixture, this is most often caused by vacuum leaks, it only takes a small leak to set the lean codes for the O2's and turn the check engine light on, I am a 25 Year Ford dealer tech and this is the common cause of O2 fault codes, to check for vacuum leaks get a bottle of propane and attach a piece of rubber hose to the end, spray propane around the top of the engine, work slowly and hit all vacuum hoses and the top and edges of the intake manifold, if u hit a leak you will hear the engine change tone most times or increase in rpm slightly, then look closely for the leak, it can be leaking intake gaskets or a cracked rubber vacuum line, even a leaking Vacuum brake booster can set these codes, if u don't find anything obvious it is time to have the dealer hook up there scanners and look at what is going on in the fuel system to create the O2 codes, don't hang anymore parts on, u have already wasted about $100 I would guess.
Posted on Oct 17, 2009
B1 means the sensor is located on the same bank of the engine that has the #1 cylinder. B2 is located on the opposite bank.
S1 means the sensor is located BEFORE the catalytic converter
S2 means the sensor is located AFTER the catalytic converter
You didn't say which engine you have, so I've included the diagrams of both 4 cyl and 6 cyl so you can see the banks
Posted on Oct 20, 2009
Here's a pic of the PCM location...
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Posted on Jun 21, 2010
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