check engine code P0171

[prizm01]

Hi,

I have a Chevy prizm 2001, it has got engine light on, the obd code shows P0171, As such I dont have any trouble driving except that there has been a reduce in the pickup

what could be the reason ? Any idea how much it could cost ?

Thank you

[carz1]

The P0171 code is for a 'Fuel Injection System Lean.' You're also probably noticing some hesitation in accelerating and a decrease in power. The problem is in the MAF (Mass Air Flow) sensor. It's a $5 fix that will save you $500 from the dealership. The MAF sensor is probably dirty and just needs to be cleaned. With a dirty sensor, the rush of air coming into the engine doesn't register and causes a lean stumble.

All your need is a philips screwdriver and a $5 can of electric parts cleaner. From the repair manual from the Prizm, you will notice the MAF sensor is located in the air filter housing. Just unscrew the two screws to the MAF sensor, unlink the power and you can see just how dirty the sensor is. Now that the sensor is disconected, DON'T TOUCH THE MAF SENSOR WIRES INSIDE! The sensor is very small and delicate. With the electric parts cleaner, just spray and let the dirt and grime disolve. I also found compressed air to be handy to help release the dirt after using the electric parts cleaner.

Once the part is clean, connect the power and screw in the sensor. You will have better power and acceleration, as well as the check engine light ready for reset. Just reset the ECU or delete the code from the ECU.