Question about 2001 Hyundai Sonata

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Hyundai sonata 4 cyclinder touble code P0171

Check engine light

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  • madfam Feb 08, 2009

    I want to add, it intermittently acts fuel starved momentarily.

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Sometimes the mass air flow sensor will become clogged with some miniscule particles of dust or whatever else. When you open up your hood somewhere near where the air filter box is, there will be a hose running from that to the engine, the mass air flow sensor should be somewhere in near there. They are easy to remove and should be held in place with a few screws. Make sure not to touch any of the electrical connectors on the inside or allow them to get dirty. I used mass air flow sensor cleaner from the local parts place but it is a bit pricey. There may be some alternative cleaners available that are not as expensive. Take the sensor to a relatively dust free area and spray it all over with the cleaner and allow to dry. At the same time under the hood where the sensor was spray that area as well. Once the sensor has dried out re-install it and you should notice an improvement. If the problem still persists you may need to change your spark plugs, or spark plug wires.

Posted on Feb 18, 2009

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Mass air flow sensor could be the cause. you can try and clean it with some throttle body spray.

Posted on Feb 09, 2009

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My daughter has a 2006 sonata v6 it threw 8 codes p0171-p0174 and p2187-p2190. it was starting by spraying starting fluid I changed the fuel pump, evap purgevalve,plugs,mafsensor,crank sensor,


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Check engine light is on in 2001 Hyundai Sonata 4 cyl with error code P0171


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Apr 21, 2010 | 2001 Hyundai Sonata

1 Answer

I have a sonata 2007 . which oil you offer to me?


2007 HYUNDAI SONATA 2.4L 4-cyl Engine Code [C]

All TEMPS......5W-20 preferred
Above -18C......10W-30 optional
Engine, with filter..........4 liters

2007 HYUNDAI SONATA 3.3L 6-cyl Engine Code [F]

All TEMPS......5W-20 preferred
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Nov 29, 2009 | 2007 Hyundai Sonata Limited Sedan

1 Answer

Check engine light is on


There are many causes to this problem, but you might need to take it to a shop to find the real problem.
Here's everything I know about it.
P0171 System too Lean (Bank 1)
How does a P0171 code trigger the check engine
light? This code will trigger the check engine light as follows:

The adaptive fuel strategy in the vehicle's computer constantly monitors the fuel delivery system to make sure the engine is running at an optimum air to fuel ratio, which is 14.7:1. The computer adjusts injector pulse width to regulate the amount of fuel going into the engine. The oxygen sensors relay information to the Powertrain Computer Module (computer), informing it of the oxygen content in the exhaust. This information is translated by the computer, and used to determine if more or less fuel is needed. The computer will then adjust fuel flow (and possibly other related engine operating characteristics), to keep the correct air fuel mixture. This loop continues as long as the engine is running.

A P0171 check engine light code is set when the computer has reached a rich calibration limit and can not add enough fuel to maintain the correct mixture.

Possible Causes:
Fuel System:

Leaking or faulty fuel pressure regulator
Plugged or dirty fuel filter or lines
Fuel pump weak or defective check valve
Injectors leaking or faulty
Low fuel pressure or running out of fuel
Leaking EVAP system components
Faulty FRP (Fuel Rail Pressure Sensor)

Air Intake System:

Vacuum leaks
Contaminated, damaged or faulty Mass Air Flow sensor
PCV valve leak or stuck open
Air induction turbulence caused by wrong filter
Oil dipstick not seated
Air leaks after the Mass Air Flow Sensor (MAF)
Oil coated aftermarket air filter
Exhaust System:

Any exhaust leak before or near the oxygen sensors

EGR System

Vacuum line disconnected from EGR System Module (ESM) EGR valve, tube or gasket leak
EGR vacuum regulator valve leaking

Secondary Air Injection System

Mechanically stuck secondary air injection valve

Apr 12, 2009 | 2000 Hyundai Sonata

1 Answer

2004 Hyundai Sonata Error Code P0171; The check light stays on


Replaced Mass Air Sensor, but had to find someone to clear the error code P0171.

Mar 19, 2009 | Hyundai Motor 2004 Sonata

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