1999 Hyundai Elantra Wagon, 2003 Kia Sedona, 2012 Kia Sedona, 2007 Hyundai Tucson
I replaced the spark plugs today... what a PITA. 2003 Sedona with 127K miles. It still had the original plugs, so it was really hard to get apart. Anyways, I got through that. Now tonight it has a code... P0431. Bank 2 downstream O2 sensor below threshold. Any thoughts?