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Old 12 Jul 2008, 12:16 am
Join Date: Feb 2008
Posts: 52
Default o/2 sensor bad? 92 Honda Accord?

I checked the codes and nothing came up, but Im getting terrible gas milage, would it still be bad and not read it, Its obd1
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Old 12 Jul 2008, 12:31 am
Join Date: Jun 2008
Posts: 63

Oh yes.By the time check engine light comes on - it means it is completely bad. But while it is failing the O2 can still give SOME signal causing the computer think it is working.Good Luck...
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Old 12 Jul 2008, 12:46 am
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Join Date: Aug 2007
Posts: 1,338

Before you go condeming sensors you need to check the basics.the most critical adjustment on that car, in terms of fuel economy, power and performance is the valve adjustment. On that year car the valves should be adjusted every 15,000 miles. If they haven't been adjusted recently then that's where you should start.A dirty air filter can reduce fuel economy by up to 10%. Low tire pressure can reduce fuel economy by 2% for every 1 psi that all 4 tires are low (10% reduction if all tires are 5 psi low)the wrong engine oil can cut the fuel economy by up to 2% (using a 10w40 instead of a 5w20).On that car the oxygen sensor was tested for open circuit, short circuit (high and low voltage) and for switching rate (alternates from rich to lean 5 times in 10 seconds). O2 sensors that cause the fuel economy problems are the "lazy" sensors that signal a change in the mixture from rich to lean to rich less frequently than the 5 times in 10 seconds. that will usually cause the check engine light to come on.aftermarket shops recommend 02 sensors all the time. I'd prefer to see it tested before being replaced but its your money. I think that if you haven't done so before you'll get a better return on your investment doing a valve adjustment and changing the air filter.hope that helps
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