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1992 sc400 anyone no what engine code #21 and #28 mean?? thx

yes i do the main oxygen sensor circuit, 21 is for the left main bank o.s.c 28 is for the right bank main o.s.c

ok thx

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I always tell people to buy an OBDII CAN reader..Well worth the $$$$.Napa reads codes for free but does NOT test for OBD readiness.

ok thx i'll have to buy one of those

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