2003 Hyundai Elantra CEL code P1166

A4COOK

MEMBER
2003 HYUNDAI ELANTRA
108,000 MILES

So just yesterday I turned my AC on for the first time this year and my car started to struggle about 10 miles down the road. It started riding rough and then finally began to slow down completely when I pushed the gas. The CEL light came on and when I ran the diagnostic it came up with code P1166. I have done a little research about this code and it seems it can be either and Air flow problem or a Fuel restriction problem. This same thing happened last year for the first time, but my CEL light never came on so no shop could diagnose the problem, since I couldn't recreate the problem. Since then I have had no problems with the car until yesterday, although it does make a weird little cricket noise when I start the car. Do you have any suggestions about what it might be, or what a shop should be looking for, so they don't try to bull**** me. Thanks for any help.

-Amanda

5 Replies

KHLOW2008

MECHANIC
41,815 POSTS

This code does not specify what component is faulty and it is triggered by the HO2S.

The chart shows possible causes and I would suggest going through them first. Most probably some cleaning might solve the problem.

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Wednesday, June 12th, 2013 AT 8:32 AM

A4COOK

MEMBER
3 POSTS

I am having trouble downloading the chart, but I saw a few other suggestions on another website for cleaning some items that might affect this code. Are these things I can do myself, or should I take it to a mechanic?

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Wednesday, June 12th, 2013 AT 11:32 AM

KHLOW2008

MECHANIC
41,815 POSTS

It depends on how good you are at DIY. Most are quite easily done.

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Wednesday, June 12th, 2013 AT 5:18 PM

A4COOK

MEMBER
3 POSTS

I am decently good at it. I can change my own battery and lights, pretty easy stuff. I don't do my own brake pads or oil changes though, so hopefully the cleaning falls somewhere in between this range! Is there a link I can go to, to see all the instruction of what should be done?

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Sunday, June 16th, 2013 AT 3:55 PM

KHLOW2008

MECHANIC
41,815 POSTS

I don't have any links for you but some of them should be easy. Check for air leaks at the air hose between the air cleaner and throttle body for a start since that is what you did work on after which the MIL came on.