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What are code PO 171 and Po136? thanks! - 2000 Mazda 626

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Fuel rich code and O2 sensor code

Posted on Oct 03, 2009

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Posted on Jan 02, 2017

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My 04 astra has the engine management light on the codes are 10136 then 1614 can anyone tell me what these are please the car has recently had new lambda sensor


usually these codes are preceded by a letter and a o then the code .. ie po136 would be an oxygen sensor code ... recheck the codes as engine codes in this model always start with po ...

Oct 30, 2013 | Vauxhall 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

2006 xj8 code po 171 engine light is on


Lean report from right side bank #1 oxygen sensor

Replace both sides upstream sensors if over 100,000 miles

They slow down & set a mil lamp

Leave the rear monitors

Dec 02, 2012 | 2001 Jaguar XJ8

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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

2 Answers

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

2 Answers

Subaru forester PO 171 code


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.

Jul 14, 2010 | 2005 Subaru Forester

2 Answers

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

2 Answers

PO 171 and PO174 codes but different problem


transmision shifts are based on engine load imputs a 171 and 174 refer to a lean condition therefor the shift is being based on an assumed cold engine so yes it may be related

Apr 23, 2009 | 2003 Ford Explorer Sport

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