Yes, based on the provided information, a fault code of 2-1 from the ECU of a 1989 Volvo 740 Turbo automatic with no catalytic converter could potentially indicate a faulty oxygen sensor issue. However, it's crucial to remember that the absence of a catalytic converter on the vehicle may impact the emissions systems' performance and behavior, affecting how sensor readings are processed and how fault codes are interpreted by the ECU.
As a 1989 Volvo 740 Turbo is equipped with an oxygen sensor in its emissions system, the fault code 2-1 does refer to concerns with the oxygen sensor system in this particular model. It is crucial to address this issue to keep your vehicle operating properly and within legal emissions levels.
