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Code 71


md91ls
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can I clean valve or ports, how to correct this? seems to be oil leak at bottom of timing cover or crank. cant tell were its from . HELP

Code 71 for EGR Malfunction is caused by a bad EGR Vacuum Modulator. Replace this and clear your DTC. Problem solved. As far as your oil leak is concerned, you probably need some cam seals, front crank seal and maybe even valve cover gaskets. Not a lot of fun to do these seals, as all of the connectors on the old LS400's are very brittle.

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