Hey Guys!!

I have some problem with my 05 TSX. I bought car on auction (salvage title) month ago. around 2 weeks ago check engine light came on… so car was connected to the computer for scan and it showed code P0171 (fuel system too lean). Maybe someone had the same problem and will be able to help me? What I should change? Also my tsx is gas killer… I drive very poor millage (around 11mpg)
Thanks for help

sorry for my English…i don't speak well

 

Clean the MAF sensor, maybe.

http://www.obd-codes.com/p0171

 

Had this same problem w/ same code several years back. Turned out to be bad Air/Fuel Ratio sensor (Wide band O2 sensor). This part was about $210-225, which was easy to replace myself. The poor MPG is a clue that your car is running rich.

"A P0171 check engine light code is set when the computer has reached a rich calibration limit and can not add enough fuel to maintain the correct mixture.
Possible Causes:
The following is an overview of P0171 check engine light code possible causes.

Fuel System:

Leaking or faulty fuel pressure regulator
Plugged or dirty fuel filter or lines
Fuel pump weak or defective check valve
Injectors leaking or faulty
Low fuel pressure or running out of fuel
Leaking EVAP system components
Faulty FRP (Fuel Rail Pressure Sensor)

Air Intake System

Vacuum leaks
Contaminated, damaged or faulty Mass Air Flow sensor
PCV valve leak or stuck open
Air induction turbulance caused by wrong filter
Oil dipstick not seated
Air leaks after the Mass Air Flow Sensor (MAF)
Oil coated aftermarket air filter

Exhaust System

Any exhaust leak before or near the oxygen sensors."

 

These cars seem to go through O2 sensors a lot, so my money would probably be on that.

 

Hello PACman:

I have several questions:

1) How many miles did your TSX have when sensor failed?

2) What year is your TSX?

3) What kind of milleage hit did you take when your sensor went bad?


And I also have general question for you and all forum members. Do these O2 sensors have a higher failure rate in colder climates like those experienced in northern states or do the O2 sensors work just as hard in warm climates as they do in cold climates and thus have the same failure rates regardless of climate?

 

1- About 55K miles +/-.

2- 2004 (Took delivery 11/2003).

3 - My MPG norm is ~31hwy. When CEL came on, MPG went to 18-21hwy.

I doubt our O2 sensor would fail more or less due to colder climate. I've assumed my sensor failed from running over a trash bag on the freeway @ 80mph which f'd up my sensor.