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DME Control

Reconnect the fuel pressure regulator vacuum hose. Disconnect the oxygen sensor. Connect the oxygen sensor harness connector terminal to ground.
Check if the CO% level increases. If not, check wire from CU connector terminal 24 to oxygen sensor plug. If no problem is found, replace the oxygen sensor.

Fig 1: Diagram of 944 DME System Distributor Align distributor cap with its locking boss facing up.