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[Solved] Should I get an oxygen sensor?

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A few months ago I got my first car which is 1990 Opel Kadett-E 5-door hatchback with 4-MT and 1.6l naturally aspirated i4 with a single point injection system for about $900. 125k miles. Runs perfectly fine, although some work had to be done. I get about 23mpg on a highway and 16 in the city, however mechanic tells me that I can get much better gas mileage if I get a working oxygen sensor. Is it worth it? (No emissions testing required in my country)

This topic was modified 7 months ago by George02
2 Answers
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I went through 8 self-replaced O2 sensors on 2 cars in 20+ years. My experience shows, that a properly working oxygen sensor will give you slightly better gas mileage. As far as I know, this is mostly due to the fact that a faulty sensor, as soon as the car ECU detects that it is faulty, sends the ECU into limp mode with non-O2-optimized fuel combustion based on some firmware-default table values, and non-optimized automatically means more fuel consumption vs. optimized. This applies to both O2 sensors bothsides of the catalytic converter.

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It helps improve your gas mileage, but make sure you also have checked all other factors as well (correct tire pressure, good spark plugs, air filter,...)

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