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Toyota Camry Rear oxygen sensor can cause emissions failure

 
Toyota Camry Problem
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Model Years Affected: 1996, 1997, 1998

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The rear Oxygen sensors are a critical element in fuel control (unlike other vehicles) and can cause an emissions test failure for high CO and HCs. The sensing element cracks and and reports an erroneous steady state lean condition which confuses the computer, which in turn makes the fuel mixture overly rich.
  •  Rookie

    same problem here, i have a 1997 toyota camry Le that failed the emission test, the Hc levels and co(%) were too high, I recently fixed a check engine light due to 4 parts not working, the vsv for egr,egr vaccum modulator, a cracked intake hose, and the vapor press sensor, drove the car for about a week and put in like 150 miles and no more engine light, unfortunately failed the emission test, I read here that the rear 02 sensor might be bad even though no codes, I need help, please.

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  • Visitor, , 220,000 mi

    Failed smog inspection for high HC and CO
    scanned data and found rear o2 reading 0 volts and cruising speed . no codes stored and all monitors ready
    replaced o2 and vehicle passed smog

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