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Suburban Engine code 430
My '98 has 193,000 miles and the catalytic converters were replaced last year. Recently it started giving the subject engine code which is for the left bank catayst efficiency being below normal. First code was for the right bank but I cleared it and all subject codes were for the left bank.
Just before the problem started I flushed the cooling system and replaced the radiator. The truck runs fine other wise. Any one have any suggestions?
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