Kwiksen Heated 4Pcs O2 Oxygen Sensor 1 Sensor 2 Upstream Downstream 2131515 234-4821

did not help my car at all

To the one star above me, how do you give a bad review because you replaced the wrong part. I've used these sensors for years and they've been working. Sounds like you converter is bad and you replaced the wrong part. my car had 187k when I installed it along with a defouler and I'm at 240k and the sensor is still working. For any wanna be mechanics, if you plug in a scan tool and the sensor reading is bad that don't necessarily mean the sensor is bad you could have a hole in the exhaust pre-cat you could have a bad catalytic converter the converter could be clogged up or you could even have bad fuel you could have a spark issue you need to take your vehicle to get diagnosed and not just throw parts at it. Throwing incorrect parts at your car don't mean the part is faulty.