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Home >> Lexus >> 2002 >> ES 300 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1135 Or DTC P1155 >> Circuit Description

Circuit Description

Air/Fuel (A/F) sensor monitors exhaust gas oxygen content and delivers an input signal to ECM. ECM uses input signal to control air/fuel ratio. A/F sensor includes a heater. DTC P1135 is for bank No. 1 A/F sensor. DTC P1155 is for bank No. 2 A/F sensor. DTC is set when A/F sensor heater output is more than 8 amps, or when heater output is less than .25 amp. Possible causes are:

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