Skip the auto shop - Our mechanics make house calls

Q: I have questions about my 2009 kia spectra's CEL and the codes I had read. Car run's good and was running good when light came on.

asked by on

P2414, P0170 and P0171. I have looked up extensively about the issues and concerns and what to do. My husband has decided to have the car diagnosed at the KIA service dept. but what I want to know is how likely it is going to be a bad oxygen sensor. The diagnostic, replacement and labor is something that we can afford (sort of). But I am afraid that it might not be that. How long does replacing a sensor take ?? And if it's not the sensor, in your experience, what are some other common problems that create these codes and are these problems pricey or take a long time to repair??

My car has 89000 miles.
My car has an automatic transmission.

Given the three codes, a known issue with sensor wiring in that vehicle (to be discussed momentarily), and only 89,000 miles on the engine, I would judge the likelihood of sensor failure to be "average". That is, there are lots of other equally likely causes of the Codes and one, in particular, that to be ruled out as a threshold matter. If a diagnostic is "claimed" to show sensor failure be sure to ask if the sensor output was viewed on an automotive scope (or appropriate manufacturer scan tool) and if it was condemned on the basis of THAT sensor output data. If sensor output was not so viewed, the mechanic is merely guessing as to the cause of the Codes setting. Furthermore, if a sensor is replaced, be sure to RETAIN the old sensor (take it home) just in case in the coming days the check engine light illuminates again. If they do recommend changing the sensor, prior to changing the sensor carefully ask the Mechanic if the sensor is the ONLY faulty component that has caused the setting of those three codes, the implication being that if that sensor is replaced you will not have a recurrence of ANY of those three specific codes. If they can deal with all that in an intelligent manner, credibly, and to your satisfaction, you are good to go. Remember, it’s your car and your money. If they do not treat you in accordance with that reality, run for the exits. And, as you know, we are always here, so you do have other options to get your car repaired.

In Spectra’s there are reports of the Check Engine Light illuminating, signifying a fault with the oxygen sensor when in fact the real issue is simply a faulty electrical connection at the sensor. Kia vends a repair kit to address this possibility and you can ask the dealer about it. There is probably a Technical Service Bulletin published by Kia as well on this issue and the dealer will have access to that. If the sensor tests good on a scope, meaning it is not the cause of the fault, here is a short list of the other possible causes of the three codes you have written in about: MAF (Mass Air Flow) sensor is dirty or faulty; MAF sensor damaged due to leak in the silicone potting material used to protect the circuitry; vacuum leaks downstream of the MAF sensor; damaged vacuum or PCV line/connection; faulty or stuck open PCV; defective fuel injector(s); low fuel pressure; plugged fuel filter; exhaust leak between engine and first oxygen sensor; faulty fuel pressure regulator; faulty manifold absolute pressure sensor; and so forth. Basically, ANY condition that causes the engine to run lean or rick could be implicated in the three codes. Start with the simple things first, which of course is the electrical connection to the sensor. If you elect to have a certified mechanic from YourMechanic handle something like this, the service to request would be a check engine light diagnostic. Feel free to let us know how it goes and if you run into any difficulty or need further technical assistance.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • I have questions about my 2009 kia spectra's CEL and the codes I had read. Car run's good and was running good when light came on.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car not running

It sounds like you have at least two issues, the check engine light has come on accompanied by loss of power and you have an antifreeze leak. The source of antifreeze leaks can be pinpointed by simple pressure testing of...

Q: Squeaky noise at the back of the car.

This would need to be heard while driving the vehicle to try and to diagnose if it is a brake or suspension problem. Recommend a qualified mechanic check it out for you.

Q: Vehicle won't start

Hello. This is not a problem with the alternator or the starter. I have yet to see a bad starter on this vehicle. It is almost always the battery. The battery will need to be load tested to verify this....

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...