Question about 2005 Subaru Forester

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Subaru forester PO 171 code

Subaru forester PO 171 code what may cause this code?

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Your fuel system is too lean. It's typically the primary O2 sensor (on the pipe between the engine and the catalytic converter). The mass airflow sensor is also possible but the O2 sensor is a wear item requiring periodic replacement and is more likely.

Posted on Jul 14, 2010

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Fuel trim malfunction (A/F too lean) Check for vacumn leak

Posted on Jul 15, 2010

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My cadillac escalade runs rough in idle.


PO174 &171- Both banks lean. This could be caused by a defective MAF or O2 sensor but something as simple as a vacuum leak could cause this problem. Also make sure there are no air leaks from the MAF sensor to the intake manifold. I have repaired many vehicles with these codes that was caused by a vacuum leak. Hope this helps

Nov 27, 2013 | Cadillac Escalade Cars & Trucks

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Error code P 171 and P 174 and P0443


Type: OBD PO 171 --for the code discription,
cause & solutions

OBD PO 174
OBD PO 443

Sep 16, 2013 | Ford Windstar Cars & Trucks

1 Answer

PO 171 and PO 174


You did not list a vehicle, so here are the generic codes.
Code 171 is system lean bank one and code 174 is system lean bank two.
The computer is getting a signal from the O2 sensors saying the fuel system is too lean, and the computer can not make it rich.
Possible causes are low fuel pressure, vac leaks, EGR valve problems, and so on.

Jul 27, 2012 | Cars & Trucks

1 Answer

I know where the sensor 2 is but where is the bank 1 for my 1999 subaru forrester code PO 141 O2 sensor heater bank1 sensor 2?


For 1999 Subaru Truck Forester AWD 2.5L MFI 4cyl the Oxygen Sensor is located under hood, center, rear engine area, mounted on catalytic converter.

zjlimited_1032.jpg

Fig. Oxygen sensor location-Forester 1998-2002 2.5L SOHC engine (click over image for zoom).

Generally, Bank 1 is front and Bank 2 is rear.

Hope helps.

Apr 14, 2011 | 1999 Subaru Forester

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Error codes po 134 po 153 po 154 po 155 po 171 po 174


PO 134 = 02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR1)
PO 153 =02 SENSOR CIRCUIT SLOW RESPONSE (BANK 2 SENSOR 1)
PO 154 =02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 2 SENSOR 1)
PO 155= 02 SENSOR HEATER CIRCUIT MALFUNCTION (BANK 2 SENSOR 1)
PO 171= SYSTEM TOO LEAN (BANK 1)
PO 174= SYSTEM TOO LEAN (BANK 2)
I WOULD SAY YOU HAVE FAULTY OXYGEN SENSORS CAUSING THE ENGINE TO RUN TOO LEAN REPLACE THEM AND YOU SHOULD BE BACK IN BUISNESS

Feb 23, 2011 | 2004 Suzuki Grand Vitara

1 Answer

Po 748 on subaru forester


this is a code reflecting a faulty pressure contorl solenoid (A Electrical) a problem in your transmission. You will need to have this serviced by a transmission shop or your subaru dealer

Jan 08, 2011 | Subaru Forester Cars & Trucks

1 Answer

Truck has 10 different PO codes


171 and 174 mean not enough fuel po 300 multiple missfire could be not enough fuel 430 can be caused by bad ignition in the cat from not enough fuel // first thing borrow a freinds mass airflow sensor

Jul 06, 2010 | 2005 Ford F 350 Super Duty

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Code PO 171


http://www.automotiveforums.com/t473813.html

PO 171 is a system to lean code. This link will explain why this is and how to fix it,

Mar 02, 2010 | 1998 GMC Sonoma

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