Code p0171 and p0172 shown together - 2005 Nissan Almera 1.6

P0172 LEXUS - System Too Rich Bank 1
Possible causes
Faulty front heated oxygen sensor
Ignition misfiring
Faulty fuel injectors
Exhaust gas leaks
Incorrect fuel pressure
Faulty Mass Air Flow (MAF) sensor
https://www.autocodes.com/p0172_lexus.html

the following links explain the codes and practical and a procedural way of doing so as to not through parts at problem
http://www.obd-codes.com/p0171 http://www.obd-codes.com/p0172

Dirty Mass Air Flow Sensor P0171, P0172

Stuck with these codes P0174 and P0171..need help - Hyundai Forums ...

www.hyundai-forums.com/.../237193-stuck-these-codes-p0174-p0171-n...

Feb 12, 2014 - 10 posts - ‎6 authors
I've been getting these codes for awhile now which are p0174 "ECM has detected ... 06 Sonata LX 3.3L V6 ... the fact that your FE has gone down could indicate something else as .... 2014 Santa Fe Sport 2.0T AWD w/ Tech Package ... Join Date: Jul 2007 ...More on PowerTorque Tools - Hex Bits Set - SAE ...Missing: examination

p0171 p0172 p0174 p0175 p2187 p2188 p2189 p2190 - Page 2 - Hyundai ...

www.hyundai-forums.com/.../336641-p0171-p0172-p0174-p0175-p21...

Dec 25, 2014 - 10 posts - ‎3 authors
today one of my colleague who have same car sonata 2007 but with 4 cylinder.for checking ... Drives hyundai accent 2005(sold) Drives Hyundai Sonata 2006 v6 3.3L ...Due to it throwing codes for both rich and lean and after finding a thread searching those.... More on UltraSteel - Magnetic Nut Driver Set.Missing: examination

santa fe won't start, what is most likely wrong? - CarGurus

Illuminated Check Engine Lamp with Diagnostic Trouble ...

oemdtc.com/.../illuminated-check-engine-lamp-with-diagnostic-trouble-c...
May 11, 2015 - Illuminated Check Engine Lamp with Diagnostic Trouble Codes ...P2196, P2197, P0171, P0172, P0174, P0175 or P162F - 2015 Ford Transit.

Po171 not P017.1 system lean http://www.obd-codes.com/p0171

P0172 not P017.2 system rich http://www.obd-codes.com/p0172

bad mass air flow sensor , O2 sensor , PVC system problem

Here's code PO171.Here's code P0172.

Here's code P0172.here's code P0171.

Here's a guide,Code P0171 is fuel system too lean and code P0172 is fuel system to rich.

P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.Replace MAf sensor,if cleaning the MAF does not help.
OBD II P0172 Fuel System Too Rich (Bank 1).P0172 - System Too Rich (Bank 1) Essentially this DTC means that an oxygen sensor in bank 1 detected a rich condition.
When the code says that the Fuel System is "too rich," it means that the computer has been subtracting more and more fuel, which is called Long Term Fuel Trim. Ideally, the Long Term Fuel Trim should be close to 1 to 2 percent. When a code P0172 is set, it means that the Fuel Trim is anywhere from -15 percent to as low as -30 percent compensated. When this happens, the computer knows that there is an improper condition in the control of the Fuel System.


Thanks.