2000 Camaro tripping OBDII codes
Was hoping someone might have a little more experience with OBDII codes than I do and might be able to offer some insight. Lately my 2000 Camaro V6 coupe (5-sp manual; 95,000+ miles) has been tripping off its SES "idiot" light. I've got an OBDII code reader, and each time the SES light trips, the codes I download with my code reader are:
"P0131" = which is the O2 Sensor Circuit Low Voltage (bank 1, sensor 1)
"P0137" = which is the O2 Sensor Circuit Low Voltage (bank 1, sensor 2)
This has happened 3 times now (1/21/06, 2/25/06 and today, 3/5/06), each time when I'm accelerating at higher RPMs (4,000+ RPM) while accelerating thru 3rd gear. As a result of the first 2 dates, I've been keeping my RPMs below 3,000 to ensure the SES doesn't trip (except for today when I had to pass someone!). After each occurance, I've erased the error codes from the car's computer.
As I understand it, these O2 sensors tripping like this are telling me one of two possible scenarios: 1) my engine is producing a lean mixture at the higher RPMs; or 2) the O2 sensors themselves have an intermittent connection, and therefore may be malfunctioning.
I've not been able to determine quite yet where exactly these O2 sensors exist (for my codes that keep appearing)... although my Haynes manual says there are O2 sensors in the left exhaust manifold, right exhaust manifold, and a post-cat converter O2 sensor.
Does anyone happen to concur with this, or have other insight I've overlooked? Are my codes here coming from the L/R exhaust manifold?
I'm assuming that, in either scenario which may explain the codes tripping, this is not a big concern as far as being harmful to the engine (when I hit 4,000+ RPM, it's only for a moment, so if it is a lean mixture at that moment, it's probably not too much of an issue, since the rest of my driving I've been keeping below 3000 RPM...?) If this is just a lean mixture condition, could it be due to dirty fuel injectors? The Camaro just passed 95,000 miles, still on its original factory-installed fuel injectors...
Any help would be appreciated! Thanks!