View Single Post
Old 02-25-2003, 09:51 PM
joebnz joebnz is offline
Registered User
Join Date: Mar 2002
Location: Oregon
Posts: 28
My '90 M104 failed last year with pretty much the same high readings. Problem was the thermostat. Engine would not warm up fast enough which causes engine to run rich longer which causes catalytic converter to load up which causes high readings. This can also cause catalytic converter to fail. If you find this to be a problem, it could take up to an hour of driving to lower readings once corrected (need to clear out catalytic converter).
Reply With Quote