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Message: <blockquote data-quote="defcon1" data-source="post: 1386458" data-attributes="member: 30064">Ok..your problem sounds more like a sensor related problem than anything mechanical. Possible reasons for heightened fuel consumption...a) O2 sensors....one of the primary causes of bad FC. Bad or no signal to the ECU. A hand held diagnostics tool sometimes misses this, cos it only detects a bad O2 sensor when the sensor is dead...which does not happen often. They are expensive, but you can probably find some in the local scrap yard. Dont worry about whether they are the same as your or not as long as they fit, and are the same type (for the forward and rear downpipe). All O2 sensors function the same way. Only difference is in the number of wires - 2-wire is a standard sensor, 3-wire incorporates a heater to heat up fast.b) Failing MAF. If you or someone has somehow taken off and meddled with the MAF, there is a likelihood that you have managed to damage the MAF. However, this is an extremely rare thing to happen.c) Also try checking if your air filter is clogged. A lot of people think that just blowing out the stock air filter is enough to clean it. THIS IS NOT TRUE. Paper based air filters are supposed to be disposable and have a finite time of usefulness...usually only 3 - 6 months under normal driving conditions, after which they are clogged and no amount of blowing will un-clog them.d) Water temp sensors also play a part in supplying the ECU with information. Your car is equipped with at least 2 water temp sensors...one to supply a signal to your in-dash thermometer, and one to supply the ECU with a signal.My suggestion:a) Go see a mech who has a hand-held diagnostics tool and the A32 Maxima program. Record the error codes, if any. Address the problems identified by the diagnostics tool. Reset ECU and monitor over 2 weeks. While you are at it...have the mech clean the throttle body and IAC valve. HAVE HIM DISMANTLE THE THROTTLE BODY AND IAC VALVE AND CLEAN THEM PHYSICALLY IN A KEROSENE BATH WITH A BRUSH. A lot of these guys will simple spray terminal cleaner into the throttle, and polish the visible parts with a cloth. This will not work.b) If this does not work, change O2 sensors. Get some good ones from a scrap yard. Again, reset ECU and monitor over 2 weeks.c) Identify the water temp sensor that supplies the ECU with signal. Change this one. It is unlikely that you will find a functioning one in a scrap yard. This has to be new.d) There is a method of testing the MAF using a multi-meter on the maxima.org forums. There is also information on how to test other sensors. Find it and do the diagnostics...cos the MAF is a very expensive part.</blockquote>

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