What causes P0171/P0174 Lean Bank 1/2?
#1
11-12-2008, 08:16 PM
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What causes P0171/P0174 Lean Bank 1/2?
I ran this code at Advanced the other day. Does anyone know what could cause this? The only indications I have of a problem from the truck, besides the codes, is the idle fluctuating +/-200 RPM on start up and sometimes dying at idle when engine is still cold. The check engine light goes out every once in a while but is on most of the time.
#3
11-21-2008, 10:00 PM
#5
11-21-2008, 11:24 PM
#6
08-16-2009, 12:28 PM
#7
06-04-2014, 03:41 PM
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#8
06-05-2014, 09:52 AM
If you don't visually seem a vacuum leak you can try spraying some carb cleaner around the top of the engine and listen for changes in rpm. Of course if ya have a scanner you can watch the short term fuel trims for changes when doing this. Lean Codes are usually an air leak in the intake portion of the engine. Rich codes are usually misfiring spark plugs or stuck injectors.
#9
06-05-2014, 09:53 AM
#10
07-13-2018, 04:32 PM
I get codes p0171 p0174 and po157. On my 08 dodge 1500 sxt 3.7. I changed all 4 o2 sensors, spark plugs, air filter, map sensor. Cleaned the sensor in the intake box, then I found a tube coming from the air filter box goin to the back of the engine that was dry rotted and cracked. I changed the little hose and still am popping the codes???? IAC?? Maybe im gonna change it and ill let ya know what happens!
