Oxygen Sensor Replacement Estimate for Lexus GS400

Lexus GS400 Oxygen Sensor Replacement costs $199 on average. Following is a breakdown of the labor and parts estimates.

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YourMechanic Price
$195 to $213
Labor: $70 -$88
Parts: $125
Average Dealer price
$343 to 352
Average Shop price
$239 to 248
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CarServiceYourMechanic PriceShop/Dealer Price
1999 Lexus GS400V8-4.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$204.89Shop/Dealer Price$264.02 - $384.24
1999 Lexus GS400V8-4.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$209.39Shop/Dealer Price$270.57 - $390.93
1998 Lexus GS400V8-4.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$209.39Shop/Dealer Price$270.49 - $390.78
2000 Lexus GS400V8-4.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$202.39Shop/Dealer Price$260.98 - $379.39
1998 Lexus GS400V8-4.0LService typeOxygen Sensor - Front/Upper/Upstream ReplacementYourMechanic Price$204.89Shop/Dealer Price$264.04 - $384.28
2000 Lexus GS400V8-4.0LService typeOxygen Sensor - Rear/Lower/Downstream ReplacementYourMechanic Price$211.89Shop/Dealer Price$273.55 - $395.67
Show example Lexus GS400 Oxygen Sensor Replacement prices

Parts required for a Lexus GS400 Oxygen Sensor Replacement

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All about Oxygen Sensor Replacement

With each new model year, manufacturers are adding more oxygen sensors to better manage engine operation. Some high performance engines have an oxygen sensor for each cylinder as well as one for the rear of each catalytic convertor. The sensors are located either underneath the hood or underneath the car. The oxygen sensors are connected (screwed) to the exhaust pipe, either in front or back of the catalytic converter. The front (upstream) sensors measure the amount of oxygen in the exhaust system. The purpose of the front oxygen sensor(s) is to measure how rich or lean the gases are as the gases exit the combustion chamber. Depending upon whether the exhaust gas is lean (high in oxygen content) or rich (low in oxygen content), the amount of fuel entering the engine is adjusted by the engine management computer to try and maintain an ideal mixture that produces the lowest emissions output from the catalytic convertor. Rear (downstream) sensors are located behind the catalytic converter. The purpose of the rear oxygen sensor(s) is to monitor the oxygen content of the exhaust gases leaving the catalytic convertor. If one or more of the oxygen sensors are faulty, your car may not pass the emissions test. If you drive your car with a faulty oxygen sensor, you may get poor gas mileage and it can damage the catalytic converter.

Oxygen Sensor Replacement Estimates for Popular Lexus Models