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2000 chevy blazer engine code po171 po174

What are these codes ? po171 po 174

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: Code PO171 and PO172

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

Check this website out. Hope it helps!

Posted on Jul 15, 2008

Molson02536
  • 3854 Answers

SOURCE: 2004 chevy aveo that the

P0128 - the thermostat may be stuck open or has anyone put a colder thermostat in the car,because once it starts to get cold it will throw a SES with a colder then stock thermostat. Replace the Thermostat should fix this problem.

PO700 is a code telling you there are codes in the TCM of some late model cars where the Transmission control module has been removed from the PCM the vehicles main computer , and basically it happens when the TCM has a issue within itself or the transmission that sets a code and it sends a request for the PCM to illuminate the SES or CHECK engine light. To get at the TCM codes requires in most cases the most up to date scanner software purchased after the cars model year and as of yet is still a little iffy. Standard OBD11 scanners will generally not be able to see these codes.

P1781 is set during engine start up when the ECM & TCM do not communicate properly during initial power up. It will only illuminate the service light if the condition occurs in 2 consecutive start cycles, but the DTC will be stored in the failure records after the first cycle.

Replace the Thermostat and go to a transmission shop that can read the DTC codes with a scanner and reset the ECM for clear the codes. Most Transmission shop will do that free of charge, if not turn the Ignition key's to the on position and and pull the ECM fuse out for 30 seconds and then place it back in. Turn the ignition keys to the off position for 10 seconds and then start the car, the engine may stall but let it. Just start the engine again, the ECM is just relearning the engine and go for a test drive. This will clear all the DTC history in the ECM like the day it cam off the assembly line. Good luck and keep me posted, be glad to answer ay more question.



Posted on Oct 30, 2009

Atyourdoor
  • 93 Answers

SOURCE: chevrolet blazer 2000 abs and break light keep

Hello , the abs code is prob just a maintainence light, prob is fine but GM likes to get you into the shop to have it periodicly checked out. If the abs brakes work and pulsate properly then its fine. The brake light may be a low fluid level in the master cyl reservoir . Clean the cap well and add fluid , the proper type and rating in needed. Fuel pressure sensoe may be due to a weaking fuel pump , weaking pressure regulator or dirty fuel filter. Thank you , Quinn

Posted on Mar 13, 2010

  • 181 Answers

SOURCE: 99 chevy tahoe...5.7 po171,po174,po420

P0171 and P0174 Means engine is running lean-Possible a dirty mass air flow sensor (can be cleaned with brake clean) failing fuel pump, vacuum leak...

P0420 means your catalytic convertor is failing-time to see your exhaust shop

Posted on May 06, 2010

heres2maine
  • 84 Answers

SOURCE: error codes PO171, PO174 on

P0171 means: System too lean (Bank 1) P0174 means: System too lean (Bank 2). Sounds like your injectors are not getting enough fuel.

Posted on Nov 17, 2010

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1 Answer

Po171 po174 code


Lean bank 1 and bank 2 , and throttle actuator system fault. Check reason for lean codes 1st, vacuum leak(s), air inlet boot and hoses, or low fuel pressure / clogged filter. Repair as needed then clear codes and recheck .

Jan 09, 2014 | Cars & Trucks

1 Answer

Po174 po171


most shops will charge you a fee for diagnose this codes and make repairs, take the car to a shop to get an accurate estimate.

Dec 24, 2013 | Mazda Cars & Trucks

1 Answer

2003 Ford Expedition check engine light on .Codes PO171 & PO174


This is a tough one could be mass air flow sensor ,oxyegen sensors,a fuel filter. a vacum leak, a pcv valve if i missed anything just google po 171 &174 look for fix ya this issue has been addressed many times first check the vacum lines includeing the line on the pcv valve for cracks or splits in the lines .I would do the fuel filter if it hasnt been changed in the last couple of years , if still a problem the MAF sensor if your happy with my advise please leave me with great feedback

Feb 18, 2013 | 2003 Ford Expedition

1 Answer

Please tell me what this means,,, po171 band 1 system too lean and po174 band 2 system too lean, thank you, jill


PO 171--is an O2 Sensor Code for a Lean Condition
on Bank 1 (right side exhaust)

PO 174 -- is an O2 Sensor Codes for a Lean Condition
on Bank 2 (left side exhaust)

You gave us no vehicle
You gave us no drivability issues or
vehicle history,nothing

If the O2's have 100,000 miles on them,change the (2)
closest to the engine. They are most likely worn out
& the switching times are too slow to control injector
pulse width & thus set a MIL Lamp (OBD2 Fault ) on
your dash

You can learn a lot on the internet if you put OBD2 in your
Search Engine (Internet Explorer,etc)

Jul 15, 2011 | Lincoln Town Car Cars & Trucks

1 Answer

Codes po171 po174 and 1569 2000 windstar


Possible intake gaskets are leaking.There is a bulletin for the p0171 and p0174.These are engine running lean codes.Not sure on the 1569 code.

Dec 01, 2010 | 2000 Ford Windstar

3 Answers

Engine light on mercury mountaineer code PO 174 PO 171 how do i fix it......


mass air flow sensor & the PVC assembly needs to be replaced

Jan 16, 2010 | 1998 Mercury Mountaineer

1 Answer

I have replaced all 4 ox senors before I replaced intake man. gaskets. It is a 97 chevy W/Truck with a V6 auto, auto trans. 2WD. now service engine soon light came on after about 200 miles, it will go off...


First did you clear all the fault codes after your repairs? The reason I ask is po131 is bank one oxygen sensor, po174 is engine lean from faulty oxygen sensor, and po171 is engine lean condition, possibly from vacuum leak (intake manifold gasket?), pcv valve,etc. To check for vacuum leak at intake, start engine and gently spray starting fluid around intake gasket. If rpm raise slightly while doing this then there is a vacuum leak(stay away from air filter intake and housing though), and the gasket will need to be replaced again.

Jan 09, 2010 | 1997 Chevrolet C1500

1 Answer

What do these trouble codes mean p0171 and p0174


po171 is system too lean,bank 1,po174,is system too lean,bank 2,It sounds like a fuel pressure problem.

Jan 05, 2010 | 2000 Chevrolet Blazer

2 Answers

I have a code that i need to get the right part..PO174


po 174 is typically accompanied by code po 171 however the code is normally a vaccum leak fords normally have an issue with the pcv valve hose collapsing a busting or either the plastic intakes have a vaccum leak that clears up when the engine warms up which is normally the upper plenum gaskets

Oct 19, 2009 | 1999 Ford Windstar

1 Answer

Po171 po172 po174 po175 ???


If the fuel pressure was low enough to give lean codes then u would have a loss of power that you would easily notice, you say you checked for vacuum leaks, did you use a can of carb spray or a bottle of propane? it only takes a very small leak to trigger the codes, spray carb spray around the intake area, see if the engine sound changes, this will indicate a leak,

Nov 11, 2008 | 2000 Honda Passport

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