I ordered both the Map sensor chip and the O2 sensor chip. The MAP sensor chip gave a tiny boost in engine smoothness but the O2 sensor chip made my check engine light come on and stay on. Also my fuel economy dropped from 72 MPG to 42 MPG. I returned it and out of $102 that it cost me they refunded $60. Rip off waste of money bad company lies and deception. When I said the items didn't do what they said they asked if I had professional installation. The website says easy to install. They treated me like S&%T when I wanted to return... read full review »