Hi - I never put my head under a bonnet except to charge a Battery or fill oil up until recently and don't know much about cars at all. But I'm broke so, needs forced me to try and fix the car but now I am stuck. I was having a problem that the car, it wasn't pulling very well and then engine light came on, so I bought a cheap OBD reader and it comes back with P2196 o2 sensor signal biased /stuck rich Bank 1 Sensor 1 So, I cleaned the MAF with some proper spray and while i was there ch