P0154 - 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
The oxygen sensors are critical to the engine running properly. It basically informs the PCM (Powertrain Control Module) of oxygen content of the exhaust. The PCM then uses this information to regulate fuel into the engine and maintain proper air:fuel ratio. It is a four wire sensor, with the PCM providing a reference/signal voltage of about half a volt (0.5v) to the sensor. It usually provides a ground also. The other two wires are dedicated to the oxygen sensor heater element. This heater allows the sensor to warm up faster, which allows the engine to enter closed loop faster, reducing startup emissions. The heater element is supplied a 12v feed from the power distribution center (usually) and a ground.
The oxygen content of the exhaust affects the O2 sensor resistance. This resistance produces a counter voltage on the reference/signal wire that the PCM will use to analyze oxygen in the exhaust. Lean exhaust produces low voltage, while rich exhaust produces high voltage. The oxygen sensor is capable of varying between 0.9v (rich) and 0.1v (lean). Once the engine reaches closed loop, the O2 sensor should begin switching rapidly between rich and lean voltages 2-3 times per second. If for some reason the O2 sensor doesn't switch properly or "sticks", P0154 may set. This code indicates the O2 sensor isn't operating.
P0174 - System Too Lean (Bank 2)
Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 2 is generally the side of the engine that doesn't have cylinder #1.
Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.
You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.
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Po 154 solution...bank 1= side of engine that # 1 cyl. is located (they are different on different cars) #1 cyl. is most forward cyl. on the engine block...(easy to see ) look at valve covers see what one is closer to front of engine ok now ..sensor 1 =before cat.converter ( upstream )sensor 2 = after cat.converter ( downstream ) the soloution to po154 is check dealer for pcm updates first.....if that dont fix it then replace corasponding bad sensor with only oem or nippondenso oem exact replacement universal o2 or ho2s sensors will not work to fix problem in most cases oem cost about $250 nippondenso $135 at local parts store
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P0174- is system to lean ( bank 2 )---po154- is 02 sensor curcuit no activity ( bank 2 sensor 1 ) po-174 fix is- •The MAF (Mass Air Flow) Sensor is dirty or faulty it may need cleaning. There could be a vacuum leak downstream of the MAF sensor. In the vast majority of cases, simply cleaning the MAF sensor does the trick. check all vacuum lines and the pvc system for leaks. po154-
here is po154 fix--Bank 2 is the one after the cat (also called the downstream O2 sensor). You need to replace the O2 sensor, buy one from the dealer or get a denso one. You will also need a O2 socket to get the O2 sensor off. I've never changed one but I think you just find it (look for a plug thing with a wire coming out of it right after the cat), unhook the wire, unscrew the old one, put anti-seize on the new one, screw it in, and hook up the wire . good-day !
carl you dont know what your talking about thats real bad info !!!
thats what my info. says!
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