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In general what do the more expensive sensors have that the cheaper ones don't? There is no functional difference; all 4-wire narrowbands should exhibit the following: useful voltage range 0.1 - 0.9 V stoichiometric AFR at 0.45 V low voltage = lean condition, high voltage = rich condition Certain brands may have a quicker warm-up time or response ...


In a word? Nothing. I mean, a 4-wire O2 is going to be about the same no matter what it's made for. The connector may be different, but the guts are going to be pretty much the same. Unfortunately, you really need to know what works well with your vehicle. For instance, Bosch (from my understanding) originated the O2 sensor. Their product should be above ...

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