KOER Codes 090 & 157

[DesertGeezer]

I have a '93 Explorer that was throwing MAF and EGR KOEO codes, I cleaned both and now have a good code 111, but now am throwing both a Code 090 and Code 157 on the KOER test. HELP!!

Thanks

 

[Sams01XplrSprt]

welcome

 

[BrooklynBay]

Welcome to this forum! Did you reset the computer after you cleaned these parts?

 

[DesertGeezer]

Yes, the codes showed up afterwards.

UPDATE: Replaced MAF, cured problem. Still don't know what a Code 090 is however.

I used an Innova 3120 reader and it worked great.

Thanks again.

 

[BrooklynBay]

90 series fuel/air injection codes on vehicles with dual oxygen sensors refer to the left or front sensor. Except: 1984-1988 3.8L engines: Right sensor.

 

[MrShorty]

The only 90 code I can think of (or series of pulses that could be interpreted as 9) is from the cylinder balance test. Some code readers interpret the 9 pulses that indicate a pass on the cylinder balance test as 90 (or 090 if the reader is going to insist on 3 digit codes). When you performed the KOER test, did you trigger the cylinder balance test at the end?