Originally Posted by SonicVQ

Here is what I see:

• The fuel trims are within the normal range - good!

• O2B2S2(V) / O2B2S2(V) -> this is the rear o2 sensor voltage. A single "snap shot" of this data doesn't tell us anything. A datalog of about 1-2 minutes does tell us a lot, but I suspect your OBD tool doesn't have that function.

• Cat temps: This is a calculated value based on engine demand. It doesn't really tell us anything for this issue.

• EQ_RATB1S1 = 0.996 / EQ_RATB2S1 = 0.975: This is the equivalence ratio (aka lambda). Multiply it by 14.7 to get the air/fuel ratio. (bank 1 is ok, bank 2 is a little rich)


• O2[b]B1[\b]S1(V) = 2.29 / O2[b]B2[\b]S1(V) = 1.905 / This is the output voltage from the air fuel sensors. At idle / low engine load (air/fuel ratio of 14.7) they should be 2.2 volts. Bank 1 is a little lean bank 2 is a little rich.

As you can see, the data contradicts the trouble code.

Keep in mind the data above is a "snap shot" in time. Often the engine computer will adjust up and down and then perform an analysis to determine a average. If the average is out of a predefined range, a trouble code will be set.

A common cause for one bank to be rich and one bank to be lean incorrect crankshaft/camshaft timing. Luckily, this doesn't normally apply to out engines.

I think it is best to take it to a shop. To continue to trouble shoot requires special tools and knowledge, as I see it.

Maybe someone else will see something I missed. - Good luck!