The lambda reading you have provided may point to an exhaust leak, but without an exhaust leak it will mean a weak running condition of the engine.
EDIT # 2: I rescanned, looking at the correct data, and found the rear O2 sensor was definitely bouncing up and down with the forward sensor's
lambda reading.
Held at 2770 rpm and measuring 80 * C both according to their equipment for 30 seconds
the lambda read 1.017 which was fine, but the CO read 0.46 % with a max allowed of 0.3 %.
Not exact matches
At the bottom of an article on viruses, we
read: «A previous version of this article misstated the probability that all four mutations for
lambda viruses would arise at once.
According what I've
read in Engine Management: Advanced Tuning, this slightly lean
lambda is a very reasonable target for steady state cruising conditions:
This seems perfectly reasonable to me, that the ECU can extrapolate and / or provide safe values based on
lambda values and TPS (Throttle Position Sensor)
readings.