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Home >> Chevrolet >> 2006 >> Optra5 LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.6L (L91) >> Diagnostic Information and Procedures >> DTC P0131 or P0137 >> Circuit/System Verification
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Circuit/System Verification

With the engine running, observe the heated oxygen sensor (HO2S) voltage parameter. The reading should fluctuate above and below the range of 350-550 mV.

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