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08 Kia Sportage 2.7l v6 156000 miles
03-01-2017, 07:53 PM
Post: #1
08 Kia Sportage 2.7l v6 156000 miles
Check engine light is on and have had it scanned and codes are p0150 and p0102

P0150 is the o2 sensor needs changed
P0102 is the maf sensor needs to be cleaned

When I researched this p0150 code I think it said the bank 1 sensor 2 needs to be fixed. My question is how many o2
Sensors does this vehicle have and is it best to replace all o2 sensors at one time
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03-01-2017, 10:28 PM
Post: #2
RE: 08 Kia Sportage 2.7l v6 156000 miles
Bank 1 is the side of the engine with the #1 cylinder. On a straight engine there is only one bank. On a V type engine you need to stand on the side and figure out which bank is closer to the belt pulleys, which is where #1 cyl will be.

Sensor 1 is closest to the engine and sensor 2 is after the cat. If it's a wye pipe going into a single exhaust then sensor 2 covers both banks so there is only one sensor back there.

Bottom line is a straight engine will only have 2 sensors and a V engine can have 3. (4 if it's got dual exhaust and dual cats)

As for that P0150 code, I see conflicting info on the web. Every site with a full list of codes puts all O2 sensors in the P013x - P014x range, showing high, low, and no activity. High or low voltage usually means there's another problem... kinda like a fuel gage reading low, but you don't change the gage to fix that, you fix the source of the problem. OTOH, "no activity" usually means the sensor is bad.

P0102 comes up with " Mass Air Flow or Volume Air Flow Circuit Low Input" which means the ECM isn't seeing much air flow. Cleaning wouldn't hurt but it could also be a major vac leak or a bad MAF too.

The key to following your code reader would be to tackle whichever code shows first on the list. IOW, if the P0102 shows up first then solve that before heading to the O2 sensors. IOW, you may find the mix is too lean for there to be much activity down stream so it sets a code which may be the result of the first problem.

BTW, it's not necessary to change all of the O2 sensors at the same time. Just change whatever is bad once you figure out the bigger problem.
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