omg do NOT go to your mechanic or the dealership. they are ripping you off by over $200. you can EASILY do this yourself.
you just need an O2 sensor for an 88 turbo. the turbo and NA supras are different. the turbos have a 3 wire sensor and the NA has a 1 wire. make sure you get the 3 wire replacement. from what i know, the Denso 02 sensor is the 3 wire one and the Bosch one is 1 wire. they run for about $50 or so. And it will take you about 5 mins to put in.
just look under the hood on the passenger side. In my NA the o2 sensor is on the headers. on the turbo models i believe the o2 sensor is on the downpipe. but still reachable from the passenger side by the intake.
this will take you 5 mins.....super easy.
go to your local auto place, and try and look for a carbon cleaner to spray into the intake. i think there is a product i heard some people talking about a while ago called seafoam? im not quite sure.
but seriously, do not go to your mechanic or dealership for the o2 sensor. you can save over $200.
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