![]() Intake, exhaust and crankcase breather systems tight and without leaks (check with smoke tester). It is important to complete all of the above steps in the test plan and ensure that none of the following may be a cause of the fault:Ģ. Functional check of O2 sensor heating after repair. Troubleshooting, function of O2 sensor before converter.Ħ. Electrical system troubleshooting of O2 sensor before catalytic converter.ģ. Perform the following test plan as recommended with the latest version of ISTA.ġ. This can be cause by an actual engine problem and/or DME software diagnostics. ![]() The Service Engine Soon (BMW’s MIL) may be on, with DTC 118602 stored (oxygen sensor before catalytic converter, fine mixture control, exhaust gas after converter too lean). ![]() ![]() This bulletin applies to BMW 5 Series vehicles equipped with the N20 engine.
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