codes 998 and 157 | Ford Explorer - Ford Ranger Forums - Serious Explorations

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codes 998 and 157


Active Member
January 25, 2007
Reaction score
City, State
Tallinn, Estonia
Year, Model & Trim Level
explorer '93
Hi all!

Some days ago my CEL lighted up. I did run the codes and got KOER 998 and 157.

157 - MAF sensor went below 0.4 volts during the last 80 warm-up cycles.
998 - Hard fault present

first i did not know what to do. I started with the cheking the MAF and there it was.. the MAF connector was little loose ... plugged it off and on and CEL was gone.
Hope this helps someone.

Have a nice holidays