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What do po155 mean? - 1999 Chevrolet Astro

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Assuming you mean p0155 obd code is an o2 sensor heater circuit fault this could be the heater in the o2 sensor itself check for continuity or it could be a short in the wiring harness. Clear the code and see if it comes back! If you have done more than 100k miles in your car the o2 sensor is most likely due for replacement. best to confirm the fault first

Posted on Apr 15, 2014

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P0155 is bank 2 ( right side) sensor 1 ( upstream the one closest to or in the manifold) check connection if ok likely is o2 sensor failure spray penetrant first then take it slow as not to strip threads

Posted on Apr 15, 2014

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