The “OR” you circled likely stands for “Out of Range” or “Over Range.”
It means the λ (air–fuel ratio) sensor couldn’t properly read the value at idle speed — possibly due to unstable idle, misfire, or sensor limitation — so no accurate lambda reading was recorded there.
Interpretation of your values
Idle (1740 RPM):
HC = 1706 ppm → a bit high (suggests incomplete burning at idle)
CO = 1.08 % → within limits
λ = OR → sensor couldn’t read
O₂ = 9.92 % → quite high → lean combustion
CO₂ = 5.80 %
2500 RPM:
HC = 426 ppm → much better
CO = 0.49 %
λ = 1.44 → slightly lean (normal)
O₂ = 6.64 %
CO₂ = 8.50 %
Overall Status: PASS → the car meets emission standards.
So, in short, this chart shows your vehicle passed the exhaust emission test, even though the λ value at idle couldn’t be read.
The “OR” you circled likely stands for “Out of Range” or “Over Range.”
It means the λ (air–fuel ratio) sensor couldn’t properly read the value at idle speed — possibly due to unstable idle, misfire, or sensor limitation — so no accurate lambda reading was recorded there.
Interpretation of your values
Idle (1740 RPM):
HC = 1706 ppm → a bit high (suggests incomplete burning at idle)
CO = 1.08 % → within limits
λ = OR → sensor couldn’t read
O₂ = 9.92 % → quite high → lean combustion
CO₂ = 5.80 %
2500 RPM:
HC = 426 ppm → much better
CO = 0.49 %
λ = 1.44 → slightly lean (normal)
O₂ = 6.64 %
CO₂ = 8.50 %
Overall Status: PASS → the car meets emission standards.
So, in short, this chart shows your vehicle passed the exhaust emission test, even though the λ value at idle couldn’t be read.