Hi all,

I have a 2009 Sonata with the 4 cylinder engine. My car starts and runs fairly normal but it has a slightly rough idle. My check engine light is on and when I check the codes I receive P2195, P0170, P2414, P2237. From what i've read online, it looks like the Sensor 1 Bank 1 O2 sensor needs to be replaced and that might solve my issue. I wanted to know if anyone had experience with a similar situation and if they fixed the rough idle from replacing the sensor? I know it would probably fix the codes but is my car idling poorly because the system is running too rich or could it be from something else as well? I'm mainly concerned with the idle.

 

Before spending money I would check the electrical harnesses first. P2237 means there is an electrical problem related to the HO2 sensor. But it does not say if it is internal to the HO2 sensor or external.
Since the computer does not get any valid inputs from the HO2 sensor it can't calculate the proper fuel trim and throws all the other codes.

There are ways to check the HO2 sensor. You may find them on youtube.

 

Those are some great leads to go off of. Thank you allegretto! I guess there probably isn't an easy answer for why I have so many codes unless I change the O2 sensor to find out. This is my brothers car and i'm not 100% on all the maintenance he's done on it. I wasn't even sure if I wanted to mess with it unless it was something inexpensive and easy to do..

How many miles on the car? -- about 155K
What kind of maintenance has it received and at which mileage? -- standard oil changes and air filter replacement at recommended times. It had a power steering pump replaced after like 50K miles but that was many years ago.
In what kind of state is the air cleaner? -- i'm not sure at this time but i can/will update down the road if I plan to dig further into this.
How many miles are on the spark plugs? -- as far as i'm concerned they are original to the car
Are any of the vacuum hoses disconnected or broken? -- not that I know of but I can look.

Thanks for the feedback again. If I replace the O2 sensor I will update with results

 

I actually revised my original answer. Thanks for adding this information though.
New spark plugs are in order.
Then I'd rather check the wiring harnesses first, then the Heated O2 sensor and vacuum leaks later. The computer cant' do anything without a stream of data coming from the sensors.