Table 1-OBD Emissions Thresholds for Diesel-Fueled/Compression-Ignition Engines Meant for Placement in Applications Greater Than 14,000 Pounds GVWR (g/bhp-hr)
Component | § 86.010-18 reference | NMHC | CO | NOX | PM |
Model years 2010-2012: | |||||
NOX aftertreatment system | (g)(6) (g)(7) | + 0.6 | |||
Diesel particulate filter (DPF) system | (g)(8) | 2.5x | 0.05/ + 0.04 | ||
Air-fuel ratio sensors upstream of aftertreatment devices | (g)(9) | 2.5x | 2.5x | + 0.3 | 0.03/ + 0.02 |
Air-fuel ratio sensors downstream of aftertreatment devices | (g)(9) | 2.5x | + 0.3 | 0.05/ + 0.04 | |
NOX sensors | (g)(9) | + 0.6 | 0.05/ + 0.04 | ||
"Other monitors" with emissions thresholds | (g)(1) (g)(3) (g)(4) (g)(10) | 2.5x | 2.5x | + 0.3 | 0.03/ + 0.02 |
Model years 2013 and later: | |||||
NOX aftertreatment system | (g)(6) (g)(7) | + 0.3 | |||
Diesel particulate filter (DPF) system | (g)(8) | 2x | 0.05/ + 0.04 | ||
Air-fuel ratio sensors upstream of aftertreatment devices | (g)(9) | 2x | 2x | + 0.3 | 0.03/ + 0.02 |
Air-fuel ratio sensors downstream of aftertreatment devices | (g)(9) | 2x | + 0.3 | 0.05/ + 0.04 | |
NOX sensors | (g)(9) | + 0.3 | 0.05/ + 0.04 | ||
"Other monitors" with emissions thresholds | (g)(1) (g)(2) (g)(3) (g)(4) (g)(10) | 2x | 2x | + 0.3 | 0.03/ + 0.02 |
Notes: FEL = Family Emissions Limit; 2.5x std means a multiple of 2.5 times the applicable emissions standard; + 0.3 means the standard or FEL plus 0.3; 0.05/ + 0.04 means an absolute level of 0.05 or an additive level of the standard or FEL plus 0.04, whichever level is higher; these emissions thresholds apply to the monitoring requirements of paragraph (g) of this § 86.010-18 .
Table 2-OBD Emissions Thresholds for Gasoline-Fueled/Spark-Ignition Engines Meant for Placement in Applications Greater Than 14,000 Pounds GVWR (g/bhp-hr)
Component | NOX | NMHC | CO | § 86.010-18 reference |
Catalyst system | 1.75x std | 1.75x std | (h)(6) | |
Evaporative emissions control system | 0.150 inch leak | (h)(7) | ||
"Other monitors" with emissions thresholds | 1.5x std | 1.5x std | 1.5x std | (h)(1), (h)(2), (h)(3), (h)(4), (h)(5), (h)(8), (h)(9) |
Notes: 1.75x std means a multiple of 1.75 times the applicable emissions standard; these emissions thresholds apply to the monitoring requirements of paragraph (h) of this section; The evaporative emissions control system threshold is not, technically, an emissions threshold but rather a leak size that must be detected; nonetheless, for ease we refer to this as the threshold.
40 C.F.R. §86.010-18