Error code
Infiniti All models code P0031
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Meaning
Upstream O2 sensor heater circuit low, Bank 1. The heater element in the upstream sensor has failed or has a short to ground. Replace the upstream oxygen sensor. Common on VQ35DE past 100,000 miles
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Address of this page: https://www.remfixit.com/tr/infiniti/tum-modeller/p0031