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Message: <blockquote data-quote="bsinischo" data-source="post: 15962" data-attributes="member: 4787"><p>Hello! My sisters 2010 equinox 2.4 L had a code for heater circuit voltage low bank one sensor one (P0037 I believe) so I went ahead and replaced the sensor with a quality one. Now the code for the heater circuit has gone away, but now it throws a code for P1133. Is this most likely a wiring issue if I already replaced the sensor, or most likely an issue with the sensor I replaced? When I replaced the sensor I inspected the wiring and didn’t see anything although I’m sure it could still be faulty. The car does seem to run rich/lean on startup ever since she has had it (even before o2 sensor was replaced)..takes about a minute and then it will run fine and clear up.</p></blockquote><p></p>