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90 760 turbo O2 sensor system code problem - help 700 1990

posted by  90-760turbo on  Wed Oct 19 17:15 CST 2005
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I’m working on a 1990 760 turbo w/LH-Jetronic ECU. I get Volvo codes 221, 231, 232 all meaning faulty O2 sensor operation. I believe the O2 sensor is ok and the O2 sensor system loop works since the idle changes when a vacuum hose is pulled out. I also checked the injectors for a vacuum leak and I don’t see any problems. Has anyone experienced this?? Any help appreciated.






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