About 2 months ago, my 2013 CC sport plus had a Check Engine light and it would start running rough and stall out. Took it to an autozone and they told me it was the upstream O2 sensor. I brought a…

DIYDad

About 2 months ago, my 2013 CC sport plus had a Check Engine light and it would start running rough and stall out.

Took it to an autozone and they told me it was the upstream O2 sensor. I brought a replacement aftermarket Walker Products 250-25035 5-Wire Wideband Sensor. I couldn’t afford an oem one as it was about 200$ this was 75$.

After swapping out the faulty sensor, and clearing the code, it no longer runs rough or stall out and the check engine light never came back.

However I notice my fuel consumption is very high, higher than usual. And I am driving on high ways which usually nets me great mpgs, for example I used to drive from Kernersville NC to Edison NJ on 1 tank of gas estimate was 600 mile per tank. Now I get about 200 miles per half a tank.

I heard that since this is a GDI engine, that carbon build up can be a problem, so I spent an entire weekend taking apart my intake manifold and cleaning all 4 of my valves and my throttle body. Still having poor fuel economy.

Lastly I recently asked on a forum the same question and they believe if I replace the upstream walker unit with the OEM sensor it should correct the issue. Your thoughts on this is greatly appreciated.