Volvo Workshop Manuals > 940 L4-2.3L SOHC VIN 88 B230F (1992) > Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Technical Service Bulletins > All Other Service Bulletins for Engine Control Module: > 28107 > Dec > 91 > Engine Controls

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Fault codes when control unit does not sense reversal of signal from oxygen sensor (Lambdasond)