Question about 2000 Hyundai Sonata

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My check engine light is on!!

The computer shows code: PO171. What usually causes this problem?My mechanic says that it could be 3 things. Which of those three are most common, because I would not like to spend my money on something that is not necessary. Thank you.

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  • Jim LaRoche Jul 30, 2008

    I have a 2000 Sonata and when I start the engine it revs high, until I put it in Drive

  • Anonymous Feb 26, 2009




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Had this problem, it was the oxygen sensor, actually there are 2 of them. Had one replaced and 6 months later the light was back on, they recplaced second, no problems since.

Posted on Aug 11, 2008

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P0171 system too lean , bank 1
the most causes is :-
1- intake or exhaust leak . test the air filter in intake hose or
blocked exhaust pipe
2-MAF sensor (Manifold Air Flow sensor) locate in intake hose

3-fuel pressure or pump may be the filter blocked or need change
4- injectors may be need cleaning by use a cleaner with fuel

5-HO2S (Heated Oxygen Sensor ) locate in exhaust pipe bank 1 near the engine
check this causes , and ask for more information


Posted on Jul 10, 2008


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1 Answer

What is po171 code mean

PO171 means the engine is running lean(that means that the engine is getting too much oxygen rather than fuel)! Although replacing the 02 sensor has a chance of solving it, unfortunately it doesn't always do so.

Are there any symptoms? Rough running at any point? Loss in power? Idle problems?

This could be caused by many things: A vacuum leak, EVAP system not working properly, injector(s) clogged, or fuel pump/fuel filter issue.
There is also a very small chance that the O2 sensors become contaminated by certain types of silicone sealants installed in improper areas of the engine. I think that this last possibility would take a long time to show up in the computer.

Do you have access to an OBD2 scanner that shows live data? If so, I can give you more info how to try and pinpoint this problem.

Oct 09, 2014 | 2001 Ford Explorer Sport

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1997 buick lasabra engine code >po171

The trouble code is related to a lean engine fuel trim problem. This particular code can be caused by a vacuum leak, low fuel pressure or faulty MAF or MAP. Check for vacuum leaks first, if you cant find any broken or cracked hoses, you might want to take it to a good shop and have live data read to determine if there is a component defective.

Nov 12, 2011 | 1998 Buick LeSabre

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Check engine light po171 mechanic suggested use shell gas for a couple of tankfuls, before spending money to determine problem

Why would one fuel be any different than another

Were do these poeple get these ideas from,especially

PO171--is a common O2 Sensor Code the mechanic
should have taken care of

System too Lean (Bank 1)

Vacuum Leak most likely cause or worn out sensor

Get a real mechanic

Apr 22, 2011 | Ford Focus Cars & Trucks

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1997 Jetta GLX 4Dr two rupture vac line causing air to leak to the system . code .po171 system to lean. ,car engine light on for the second time with in two days. after my car was fix from my auto...

I would check again for further leaks in the vacuum lines, if you had two leaks so far it is really important to rule out the possibility of a third or fourth. Check all lines and junctions with the inlet manifold. Check the join between the inlet manifold and the engine block, spray any suspect areas with WD40 whilst engine is running and a leak will show itself as a sudden pick up in revs. Also check around each injector seal in the same way. The DTC indicates a lean burn condition as detected by the oxygen sensor on the exhaust. The usual cause is unmetered air ingress into the inlet manifold due to a leak. Other causes include; water in the fuel; faulty fuel pump not supplying enough pressure to the fuel rail and injectors; and faulty / clogged injectors not injecting enough fuel. Note that even a tiny air leak will imbalance the fuel air mix and cause this error. Finally check out the oxygen sensor, if this faulty it could set the error code.

Apr 14, 2011 | Volkswagen Jetta Cars & Trucks

2 Answers

Check engine light on my 01 windstar when scaned the codes were po171 and po174 bank 1 and bank 2 too lean

thats a lean code which mean there is a vaccum leak or fuel flow is low. can be the fuel filter, most likely it is a vaccum leak, spray with carb spray around the intake and the hoses and see if the idle changes

Mar 23, 2011 | 2001 Ford Windstar

2 Answers

My 2000 dodge grand caravan 3.8 check engine light lit up and indicated p0134 oxygen sensor was replaced and light turn off 15 minutes later while on the road light turn on again put back on scanner now...

the codes for the oxygen sensors and egr valve dont neccassarily mean those parts are "bad". O2 sensor codes are usually caused by a different problem all together. There job is to monitor oxygen levels in the exhaust to make sure it is clean enough to meet emmisions standards. If you have a vaccuum leak, misfire, or a fuel problem those codes can show up. The egr valve recycles the exhaust gas in another attempt to clean the impurities. If the vavle was truley bad it would of affected the was the vehicle idled and drove on the highway. The egr activates when the throttle is depressed it opens at 1/4 of full throttle and closes at idle. Though they get pretty dirty the usually dont just fail under normal driving conditions. I would say that po171 code which if i remember right is a o2 sensor lean code, is showing now you have a tune up that needs to be done or a leaking intake manifold. A dirty or failed pcv valve can also cause that code because of it being operated by vaccuum from the engine. If any vaccuum is lost or restricted the hole combustion process will be incorrect.

Mar 10, 2011 | 2000 Dodge Caravan

1 Answer

Code po171 7 po174

your computer is reporting bank 1 and 2 too lean, usually caused by the mass air flow (MAF) sensor, you can usually clean this sensor and reset the light. Clean it with electric cleaner or brake cleaner, make sure it is dry before reinstalling, also take care not to damage it. Hope this helps, let me know

Jun 09, 2009 | 1997 Ford Thunderbird LX

1 Answer


you need to change the oxygen sensor. it will soon cause you problems. after you need to take it in to  erase the code.

Apr 20, 2009 | 1997 Chrysler Town & Country

1 Answer

Codes P0171 and P0316

code po316 is a random misfire like plugs or wires po171 will cause po316 po171 is a lean o2 code on bank # 1 that is a vacuum leak need to check it better for a vac leak

Dec 14, 2008 | 2003 Ford Windstar

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