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Home >> Volvo >> 1994 >> 850 Base, 4D Sedan, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Turbo >> Diagnostic Testing >> MOTRONIC 4.3 Control System >> Code 4-3-5 (Front HO2S Too Slow)
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Code 4-3-5 (Front HO2S Too Slow)

  1. Check for other codes. If Code 4-3-6 is stored, perform testing for that code first. If Code 4-3-6 is not stored, go to next step.
  2. Perform a compression check on all cylinders. Repair as necessary. If compression is okay, go to next step.
  3. Check for air leakage in intake system. Repair as necessary. If there is no air leakage in intake system, check for air leakage in exhaust system. Repair as necessary. If there is no air leakage in exhaust system, check fuel and residual pressure. Repair as necessary. If fuel and residual pressure are okay, retest using new front HO2S.
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