The Effect of MMT on the OBD-11 Catalyst Efficiency Monitor

Paper #:
  • 932855

Published:
  • 1993-10-01
Citation:
Hubbard, C., Hepburn, J., and Gandhi, H., "The Effect of MMT on the OBD-11 Catalyst Efficiency Monitor," SAE Technical Paper 932855, 1993, https://doi.org/10.4271/932855.
Pages:
10
Abstract:
The effect of MMT on the OBD-II catalyst efficiency monitor has been investigated. The results conclusively show that manganese which is deposited onto the catalyst during the combustion of MMT- containing fuel provides for an increased level of catalyst oxygen storage capacity. This added oxygen storage was found to result in a reduced rear EGO sensor response and caused malfunctioning catalysts to be incorrectly diagnosed by the OBD-II catalyst efficiency monitor.
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