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Your Jeep Grand Cherokee (ZJ) Suspension Lift Kits source with low prices and FREE shipping on Jeep Grand Cherokee (ZJ) Suspension Lift Kits tires, wheels, bumpers, tops, lift kits and more. P0171 JEEP Meaning With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1.
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This is some sort of follow up from the exhaust header change, see link further down.- Please subscribe, it's free for you but does really help me to keep this channel going as YT just announced further restrictions to small channels which makes it even less attractive to spend time to produce new content.It all started rather suddenly with increasingly poor idle and it was obvious it's running quite rich. OBD system was showing fault code P0171 (too lean) which did not really make sense at first sight.There are many reasons which can cause this, it just happened that 3 out of the most popular 4 were appearing at more or less the same time.The fault itself is essentially the same, the engine ECU sees a condition which is not actually reflecting what the engine is doing in reality. This is usually resulting in excessive fuel trims, either lean or rich, so it runs rather lumpy with poor fuel consumption figures. On my 300 mile limp home it did about 8mpg until i pulled the O2 sensor plug to force it running open loop.