Where are the O2 sensors located

Hi, the oxygen sensor in question is located before the catalytic converter. This is "sensor 1" - which is both seen as "lean" (P0171) and delayed response (P015B). Sensor 2 is located after the catalytic converter. It could be also influencing the trouble codes. Testing is needed. You'll want to check for any exhaust leaks at or before the catalytic converter. Check for any air intake leaks - this can cause lean codes as well. C0300 is a chassis code and I do not think it is related to the engine codes. You can't just guess at replacing one or both oxygen sensors. Testing is needed and inspection to see what could be contributing to the codes being set. It's not usually as easy as replacing a sensor; the codes do not say to do that. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.