Error code P0171 - Kia Forum
 
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post #1 of 6 (permalink) Old 05-16-2007, 11:32 PM Thread Starter
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Default Error code P0171

I want to share my experience.
My car is
2002 Kia Optima 2.4/LX with ~55,000 miles.
She had the follwing problems.
-Engine check light on.
-Unstable idle.
-jerking and shaking.
-hesitation.
-horrible noisy sound during acceleration (sound like "da da da da")

Went to the Autozone, I got the error code P0171.
The suggested problems are
-oxygen sensor
-vacuum leak
-Fuel injection.

I opened the engine cover and found that the PCV hose had a big hole.
I pulled out the PCV valve and hose and cleaned the PCV valve with 3M throttle body cleaner spray. I exchaned the hose with a new one.

Now everything is O.K.!

She runs smoothly.
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post #2 of 6 (permalink) Old 05-17-2007, 06:34 AM
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Glad you fixed your problem!!!
I wish that more people posted solutions to their problems, so the rest of us could have an idea how to fix it and how much fixing it costs.

Anyway thanx for the post....cheers
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post #3 of 6 (permalink) Old 06-07-2007, 01:18 PM
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Excellent.
I'm having a very similar problem right now w/ my '01 2.4L Optima 63k miles. There's been a slight "miss" after I bought it, just before it shifting from 1st to 2nd, or 2nd to 3rd (auto tranny)... but 2 days ago it simply began sputtering like it was running on only 3 Cylinders.

Scanner code of P0300 is what a repair shop got for mine (supposedly interprets as "random misfire"), after my check light came on as well.

I have changed the Fuel Filter, PCV valve, & Spark plugs (even used the platinum NGK's at $10/plug). Still the same problem... no better than before.

I've been told that it may be the Wires, Coil, CAM sensor, or ECM.

I checked the PCV lines & throttle body hoses... no holes/leaks I can see or feel.

Thank you very much!!! I'll let u know my results.

Greg 512-261-6322
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post #4 of 6 (permalink) Old 06-08-2007, 01:59 AM
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Quote:
Originally Posted by bynesa
Glad you fixed your problem!!!
I wish that more people posted solutions to their problems, so the rest of us could have an idea how to fix it and how much fixing it costs.

Anyway thanx for the post....cheers

Agree! Us, newbies will learn a lot out of it!

bored...:mellow:
...and looking for fun!:p
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post #5 of 6 (permalink) Old 06-08-2007, 01:54 PM Thread Starter
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Hi, Greg
Here are some items related to P0300.
1. Vacuum leak in air intake system
-check hose leak (Especially PCV, ISC hose, throttle body, intake manifold, and brake booster)
2. CKPS(crank shift position sensor) circuit malfunction
3. Ignition circuit malfunction
4. Faulty ignition coil or plug wire
-check resistance of the primary and secondary IG coils(primary coil: 0.78±10% Ω at20°C,secondary coil: 20±15 kΩ at20°C)
-check the plug wire
5. Spark plug malfunction (replaced)
6. Low compression due to blown head gasket, leaking valve or piston ring
7. Low/high fuel pressure due to to faulty pressure regulator, restricted fuel lines, plugged fuel filter or faulty fuel pump
8. Fuel injector circuit malfuction
9. Faulty fuel injector

I suggest you check the IG wires and IG coils.
Hoping to fix your car...
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post #6 of 6 (permalink) Old 06-10-2007, 01:45 PM
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Quote:
Originally Posted by tii_greg
Excellent.
I'm having a very similar problem right now w/ my '01 2.4L Optima 63k miles. There's been a slight "miss" after I bought it, just before it shifting from 1st to 2nd, or 2nd to 3rd (auto tranny)... but 2 days ago it simply began sputtering like it was running on only 3 Cylinders.

Scanner code of P0300 is what a repair shop got for mine (supposedly interprets as "random misfire"), after my check light came on as well.

I have changed the Fuel Filter, PCV valve, & Spark plugs (even used the platinum NGK's at $10/plug). Still the same problem... no better than before.

I've been told that it may be the Wires, Coil, CAM sensor, or ECM.

I checked the PCV lines & throttle body hoses... no holes/leaks I can see or feel.

Thank you very much!!! I'll let u know my results.

Greg 512-261-6322
I had that problem with my rio when i bought it. it had dirty gas so i just put in fuel injecter cleaner and it fixed the problem
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