My 03 chevy monte carlo has a po102 code and I know the mass flow sensor connector is bad but will this cause the battery to drain for no reason? I hear a clicking noise coming from the gove compartment area even when the battery is dead and if I boost the car it will start and I can drive it but the next day it won't start unless I give it some gas and it's a very rough start and will cut off it I dont keep giving it gas and then the battery just slowly dies in like a day or so and I have a brand new battery.....

Po102 faulty mass air flow sensor. Po301 ECM. malfunction.have pcm checked.also make sure have a good battery voltage .if alternator or battery bad.that will cause ECM malfunction.check those things also.

code po102 refers to mass air flow(MAF) sensor/volume air flow (VAF) sensor---low input======causes --wiring short to ground---MAF/VAF sensor ---ECM

its very easy open directions below

Mass Air Flow sensor just measures incoming air flow at a predetermined rpm/load. The computer is saying the flow measurement is not correct. This can be caused by mechanical faults within the engine like a bad valve seat or timing chain but would generally be accompanied by backfires through the intake. Usually its caused by a vacume leak between the sensor and the intake valve,like the intake manifold,loose intake pipe clamps, broken vacume lines,a leaking vacume brake booster [it will hiss loud when you apply the brake],bad spark plugs/wires, a clogged catalytic converter, stuck open egr valve or pcv valve,bad oxygen sensor or even a very clogged air filter. I know there is a lot listed but the MAF or MAP sensors show general flow through the engine that can be affected by several things. A vacume tester from your local auto parts store is about 30bucks and usually has instructions how to test for vac. leaks within the engine also to determine a if thers is bad valve seat or clogged exhaust.

You Probably Need The Diagnostic Tool To Tell The (ECU)Electronic Control Unit That A New Part Has Been Installed .

CODE PO102 IS MAF SENSOR CIRCUIT LOW FREQUENCY CONDITIONS / CODE PO420 IS CATALYST SYSTEM LOW EFFICIENCY BANK 1 CONDITIONS. BAD MASS AIR FLOW SENSOR WILL AFFECT CONTAMINATE DAMAGE CATALYTIC CONVERTER DUE TO RICH EXHAUST EMISSIONS.

HI, The DTC set PO102 is for your MAF (mass air flow) sensor. this sensors measures the air moving past it my heating a fine wire much like one inside a light bulb. Even cleaning these will not get the contaminates off. That little wire gets very hot and if dirt gets on it it will bake to it then this throws off its readings for your computer. If you checked and you have your 5 volt reference for this sensor the only other thing is to replace it. You can get re-manufactured one now at any major parts store. Good luck

THE INTAKE AIR TEMPERATURE SENSOR IS A INTEGRAL COMPONENT OF THE MASS AIR FLOW SENSOR.

It's should be a simple remove and replace. Just make sure the engine is off. Also do not touch any of the filament wires on the sensor, just the plastic housing. Also after you install it drive the car for a little while (city speeds, cruising speeds and inbetween). That way the computer will be able to readjust its setting since it is a new sensor.

did it have the same code before you change the 02 sensor .cause it should of been po135 for an 02 sensor 1 bank .the mass is the one in the air breather