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Should be located in the removable housing at the engine end of the upper radiator hose
what is the sparkplug gap on a 1987 toyota corrola?
No , the 1.6 liter 4 cylinder engine in a 1987 Toyota MR2 is not an interference engine
in the tank
1-3-4-2
The Toyota mr2
by the oil dip stick
that is the oxygen sensor on the exhause manifold.
http://mr2oc.com/
behind the dashboard on the passengers side
under the hood behind the spare tire.
The O2 sensor is located on the downpipe of the MR2, although you were not specific to which MR2 generation/model you are referring to. Most are located there. The downpipe will be bolted to the exhaust manifold, which is bolted to the side of the motor closest to the firewall.