i have a 2001 gs300 with 70,000 miles on it and i failed my smog check. the smog guy said my emissions are high and my car is now a gross polluter. the check engine light is on and the code tells me the the oxygen sensors are bad, bank 1 sensor 1 and bank 2 sensor 1 i replace both sensors with denso sensors from rock auto. after i replace the sensor i drove my car for 100 miles to make sure the check engine didn't come back on and it didn't. then yesterday i took it to get smog, and it fail. when driving back from the smog place the check engine light came on again. can some please help me out why my car's check engine keep saying the oxygen sensors are bad when i replace them. i also had a srt intake with ecu on my car when the check engine light first came on, i now have the stock intake back on. please help.
I just wanted to let everybody know what had happened to my car, and what the problem was. I decide to take my car to a local mechanic to find out why the check engine kept telling me my oxygen sensors where bad when i replace them with new ones. It turns out there was nothing wrong with oxygen sensors, some how a rodent, mice or rat had chew and damage the wires at the e.c.m the mechanic replace the damage wires and now my car has passed its smog check. So if anybody gets the codes po130,133 po150,153 and cant pass there smog test check the wires at the e.c.m