Question about 1994 Ford Escort
What code 172 and 121 on 1993 ford escort mean
Posted on Mar 13, 2013
System to rich(bank 1). Clean the MAF with QD electronics cleaner and see if it fixes the problem. Otherwise, you might need to replace the 1st o2 sensor and/or the maf. bank 1 is the bank where #1 cylinder is. also check all vacuum lines. if cleaning maf sensor does not help, then replace front 02 sensor on bank 1. the one before converter.
Posted on Jul 30, 2010
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Posted on Jan 02, 2017
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