,i  #aai? ,,congress  #b;d ,session  ,h4
 ,r4 #ifah  ,,9 ,,! ,,h\se ,,(          
,,repres5tatives  ,july #i1 #bjbf,mrs4  
,f$or*ak 7= h]self1 ,mr4 ,davis ( ,nor? 
,c>ol9a1 ,mr4 ,f9/ad1 ,mr4 ,b]gman1 &   
,mrs4 ,fis*ba*7 introduc$ ! foll[+ bill2
 :i* 0 ref]r$ to ! ,committee on ,en]gy 
& ,comm]ce  ,a ,,bill  ,to am5d ! ,clean
 ,air ,act to pres]ve regulatory        
/ability = motor vehicles1 motor vehicle
 eng9es1 nonroad vehicles1 & nonroad    
eng9es1 & = o!r purposes4  #a4 ,%ort    
title ,?is ,act may be cit$ z ! ,diesel 
,eng9e ,flexibility ,act or ! ,,def     
,act4  #b4 ,pres]vation ( on-road       
vehicle & eng9e regulatory /ability     
,section #bjb ( ! ,clean ,air ,act 7#db 
,u4,s4,c4 #geba7 is am5d$ by add+ at !  
end ! foll[+3  7n7 ,pres]vation ( motor 
vehicle & eng9e regulatory /ability     
7#a7 ,guidance-bas$ safe h>bor ,dur+ !  
p]iod ( #aj ye>s beg9n+ on ! date (     
enactm5t ( ?is subsection1 implem5tation
 ( an inducem5t /rategy or diesel exhau/
 fluid quality monitor+ describ$ 9 !    

cov]$ guidance docum5ts ) respect to new
 & 9-use motor vehicles & eng9es1       
includ+ heavy-duty eng9es1 heavy-duty   
vehicles1 light-duty vehicles1          
light-duty trucks1 & light-duty eng9es1 
%all n con/itute a prohibit$ act "u ?is 
title if ! implem5tation is und]tak5 9 a
 mann] consi/5t ) ! cov]$ guidance      
docum5ts1 to ! ext5t su* cov]$ guidance 
docum5ts apply to su* a motor vehicle or
 eng9e t is requir$ to comply ) ! #bjjg 
/&>ds or ! #bjaj /&>ds1 provid$ t su*   
implem5tation is consi/5t ) o!rwise     
applicable c]tification requirem5ts &   
useful life requirem5ts "u ?is title4   
7#b7 ,regulatory /ability  7,a7         
,tempor>y regulatory /ability ,dur+ !   
p]iod ( #aj ye>s describ$ 9 p>agraph    
7#a71 ! ,adm9i/rator may n promulgate1  
revise1 au?orize1 or implem5t "u ?is    
section or section #bji7;b7 any         
regulation conta9+ any /&>d or o!r      
requirem5t applicable to new or 9-use   
motor vehicles or eng9es1 includ+       
heavy-duty eng9es1 heavy-duty vehicles1 

light-duty vehicles1 light-duty trucks1 
& light-duty eng9es1 t is m /r+5t ?an ! 
#bjjg /&>ds & ! #bjaj /&>ds1 except t   
no?+ 9 ?is p>agraph %all prohibit !     
,adm9i/rator f--  7i7 approv+ s(tw>e    
updates1 repair /rategies1 diagno/ic    
improvem5ts1 or monitor+ approa*es      
consi/5t ) ! cov]$ guidance docum5ts2   
7ii7 en=c+ prohibitions aga9/ defeat    
devices1 defeat /rategies1 circumv5tion1
 fraud1 tamp]+1 or op]ations outside !  
conditions applicable to c]tifi$        
configurations "u ?is title2  7iii7     
implem5t+ any recall1 defect report+1   
c]tification1 w>ranty1 or o!r           
adm9i/rative requirem5ts t d n impose m 
/r+5t emission /&>ds or mat]ially       
increase compliance obligations         
applicable to su* motor vehicles or     
eng9es t are requir$ to comply ) ! #bjjg
 /&>ds or ! #bjaj /&>ds2 or  7iv7       
approv+ a volunt>y manufactur] action t 
ma9ta9s compliance ) o!rwise applicable 
c]tification requirem5ts & useful life  
requirem5ts promulgat$ "u ?is title4    

7,b7 ,lead "t ,aft] ! expiration ( !    
p]iod describ$ 9 p>agraph 7#a71 any /&>d
 or o!r requirem5t promulgat$1 revis$1  
or au?oriz$ "u ?is section or section   
#bji7;b7 applicable to new or 9-use     
motor vehicles or eng9es1 includ+       
heavy-duty eng9es1 heavy-duty vehicles1 
light-duty vehicles1 light-duty trucks1 
& light-duty eng9es1 t revises or       
succe$s ! #bjjg /&>ds or ! #bjaj /&>ds  
%all-- 7i7 apply = a p]iod ( no less ?an
 #c model ye>s2 &  7ii7 take effect no  
e>li] ?an ! model ye> comm5c+ #e ye>s   
aft] su* new or revis$ /&>d or o!r      
requirem5t is promulgat$1 revis$1 or    
au?oriz$4  7,c7 ,requir$ consid]ations  
,aft] ! expiration ( ! p]iod describ$ 9 
p>agraph 7#a71 9 promulgat+1 revis+1 or 
au?oriz+ a /&>d or o!r requirem5t "u ?is
 section or section #bji7;b7 applicable 
to new or 9-use motor vehicles or       
eng9es1 includ+ heavy-duty eng9es1      
heavy-duty vehicles1 light-duty         
vehicles1 light-duty trucks1 &          
light-duty eng9es1 t revises or succe$s 

! #bjjg /&>ds or ! #bjaj /&>ds1 !       
,adm9i/rator %all consid]--  7i7 ! ne$  
to r$uce unnecess>y op]ational          
disruption1 d]ates1 %utd[ns1 & relat$   
op]at+ re/rictions = own]s & op]ators ( 
su* motor vehicles & eng9es2  7ii7 ! ne$
 to pres]ve op]at+ conditions & eng9e   
configurations c]tifi$ to comply ) !    
#bjjg /&>ds or ! #bjaj /&>ds t protect !
 durability ( su* motor vehicles &      
eng9es1 selective catalytic r$uction    
sy/ems1 diesel p>ticulate filt] sy/ems1 
& relat$ aft]treatm5t compon5ts2  7iii7 
! effects ( ! propos$ /&>d or o!r       
requirem5t on resale value1 f9anc+      
expectations1 deal] inv5tories1 &       
equipm5t availability across su* motor  
vehicles & eng9es t are already 9 s]vice
 or are available = sale2  7iv7 ! co/s (
 ! propos$ /&>d or o!r requirem5t to    
own]s & op]ators ( su* motor vehicles & 
eng9es1 includ+ d[ntime1 repair1 s]vice1
 logi/ics1 & equipm5t replacem5t co/s2  
7v7 ! ne$ = nationally consi/5t         
requirem5ts = su* motor vehicles &      

eng9es2 &  7vi7 ! effects ( ! propos$   
/&>d or o!r requirem5t on h>monization  
across su* motor vehicle & eng9e        
categories & eng9e families1 equipm5t   
models1 & %>$ eng9e or aft]treatm5t     
designs us$ across on-road categories4  
7#c7 ,rule ( con/ruction ,no?+ 9 ?is    
subsection %all be con/ru$ to-- 7,a7    
au?orize p]man5t disablem5t ( an        
emissions control sy/em2  7,b7 exempt   
any new or 9-use motor vehicle or eng9e1
 includ+ a heavy-duty eng9e1 a          
heavy-duty vehicle1 a light-duty        
vehicle1 a light-duty truck1 & a        
light-duty eng9e1 f o!rwise applicable  
emission /&>ds promulgat$ "u ?is title2 
or  7,c7 prohibit ! ,adm9i/rator f      
approv+ s(tw>e updates1 repair          
/rategies1 diagno/ic improvem5ts1 or    
monitor+ approa*es implem5t$ consi/5t ) 
o!rwise applicable c]tification         
requirem5ts & useful life requirem5ts "u
 ?is title4  7#d7 ,def9itions ,9 ?is    
subsection3 7,a7 #bjjg /&>ds ,! t]m     
#bjjg /&>ds means ! /&>ds & associat$   

c]tification & compliance requirem5ts "u
 section #hf4jjg-aa ( title #dj1 ,code (
 ,f$]al ,regulations1 z 9 effect on     
,janu>y #a1 #bjbe4  7,b7  #bjaj /&>ds   
,! t]m #bjaj /&>ds means ! /&>ds &      
associat$ c]tification & compliance     
requirem5ts "u section #hf4jaj-ah (     
title #dj1 ,code ( ,f$]al ,regulations1 
z 9 effect on ,janu>y #a1 #bjbe4  7,c7  
,cov]$ guidance docum5ts ,! t]m cov]$   
guidance docum5ts means-- 7i7 ! guidance
 entitl$ ,revis$ ,guidance = ,light     
,duty ,vehicles1 ,heavy-,duty ,diesel   
,eng9es & ,nonroad                      
,compression-,ignition 7,,ci7 ,eng9es   
,us+ ,selective ,catalytic ,r$uction    
7,,scr7 ,te*nologies1 issu$ on ,augu/   
#aa1 #bjbe1 & designat$ z               
,,iacd-#bjbe-aj2 &  7ii7 ! guidance     
entitl$ ,,def ,quality ,monitor+ ,us+   
,alt]nate ,s5sor ,te*nologies1 issu$ on 
,m>* #bf1 #bjbf1 & designat$ z          
,,iacd-#bjbf-je4  4  #c4 ,pres]vation ( 
nonroad vehicles & nonroad eng9es       
regulatory /ability ,section #bac ( !   

,clean ,air ,act 7#db ,u4,s4,c4 #gedg7  
is am5d$ by add+ at ! end ! foll[+3  7e7
 ,nonroad vehicle & nonroad eng9e       
regulatory /ability  7#a7 ,guidance-bas$
 safe h>bor ,dur+ ! p]iod ( #aj ye>s    
beg9n+ on ! date ( enactm5t ( ?is       
subsection1 implem5tation ( an inducem5t
 /rategy1 repair-relat$ ov]ride1 or     
diesel exhau/ fluid quality monitor+    
describ$ 9 ! cov]$ guidance docum5ts )  
respect to a nonroad vehicle or nonroad 
eng9e1 includ+ a nonroad                
compression-ignition eng9e & equipm5t t 
uses su* an eng9e1 %all n con/itute a   
prohibit$ act "u ?is title if !         
implem5tation is und]tak5 9 a mann]     
consi/5t ) ! cov]$ guidance docum5ts1 to
 ! ext5t su* cov]$ guidance docum5ts    
apply to su* a nonroad vehicle or       
nonroad eng9e t is requir$ to comply ) !
 ,ti] #d /&>ds1 provid$ t su*           
implem5tation is consi/5t ) o!rwise     
applicable c]tification requirem5ts &   
useful life requirem5ts "u ?is title4   
7#b7 ,regulatory /ability  7,a7         

,tempor>y regulatory /ability ,dur+ !   
p]iod ( #aj ye>s describ$ 9 p>agraph    
7#a71 ! ,adm9i/rator may n promulgate1  
revise1 au?orize1 or implem5t "u ?is    
section or section #bji7;e77#b7 any     
regulation conta9+ any /&>d or o!r      
requirem5t applicable to nonroad        
vehicles or nonroad eng9es1 includ+     
nonroad compression-ignition eng9es &   
equipm5t conta9+ su* eng9es1 t is m     
/r+5t ?an ! ,ti] #d /&>ds1 except t no?+
 9 ?is p>agraph %all prohibit !         
,adm9i/rator f--  7i7 approv+ s(tw>e    
updates1 repair /rategies1 diagno/ic    
improvem5ts1 or monitor+ approa*es      
consi/5t ) ! cov]$ guidance docum5ts2   
7ii7 en=c+ prohibitions aga9/ defeat    
devices1 defeat /rategies1 circumv5tion1
 fraud1 tamp]+1 or op]ations outside !  
conditions applicable to c]tifi$        
configurations "u ?is title2  7iii7     
implem5t+ any recall1 defect report+1   
c]tification1 w>ranty1 or o!r           
adm9i/rative requirem5ts t d n impose m 
/r+5t emission /&>ds or mat]ially       

increase compliance obligations         
applicable to su* nonroad vehicles or   
nonroad eng9es t are requir$ to comply )
 ! ,ti] #d /&>ds2 or  7iv7 approv+ a    
volunt>y manufactur] action t ma9ta9s   
compliance ) o!rwise applicable         
c]tification requirem5ts & useful life  
requirem5ts promulgat$ "u ?is title4    
7,b7 ,lead "t ,aft] ! expiration ( !    
p]iod describ$ 9 p>agraph 7#a71 any /&>d
 or o!r requirem5t promulgat$1 revis$1  
or au?oriz$ "u ?is section or section   
#bji7;e77#b7 applicable to nonroad      
vehicles or nonroad eng9es1 includ+     
nonroad compression-ignition eng9es &   
equipm5t conta9+ su* eng9es1 t revises  
or succe$s ! ,ti] #d /&>ds %all-- 7i7   
apply = a p]iod ( no less ?an #c model  
ye>s2 &  7ii7 take effect no e>li] ?an !
 model ye> comm5c+ #e ye>s aft] su* new 
or revis$ /&>d or o!r requirem5t is     
promulgat$1 revis$1 or au?oriz$4  7,c7  
,requir$ consid]ations ,aft] !          
expiration ( ! p]iod describ$ 9 p>agraph
 7#a71 9 promulgat+1 revis+1 or au?oriz+

 a /&>d or o!r requirem5t "u ?is section
 or section #bji7;e77#b7 applicable to  
nonroad vehicles or nonroad eng9es1     
includ+ nonroad compression-ignition    
eng9es & equipm5t conta9+ su* eng9es1 t 
revises or succe$s ! ,ti] #d /&>ds1 !   
,adm9i/rator %all consid]--  7i7 ! ne$  
to r$uce unnecess>y op]ational          
disruption1 d]ates1 %utd[ns1 & relat$   
op]at+ re/rictions = own]s & op]ators ( 
su* nonroad vehicles or nonroad eng9es2 
7ii7 ! ne$ to pres]ve op]at+ conditions 
& eng9e configurations c]tifi$ to comply
 ) ! ,ti] #d /&>ds t protect !          
durability ( su* nonroad vehicles &     
nonroad eng9es1 selective catalytic     
r$uction sy/ems1 diesel p>ticulate filt]
 sy/ems1 & relat$ aft]treatm5t          
compon5ts2  7iii7 ! effects ( ! propos$ 
/&>d or o!r requirem5t on resale value1 
f9anc+ expectations1 deal] inv5tories1 &
 equipm5t availability across su*       
nonroad vehicles or nonroad eng9es t are
 already 9 s]vice or are available =    
sale2  7iv7 ! co/s ( ! propos$ /&>d or  

o!r requirem5t to own]s & op]ators ( su*
 nonroad vehicles or nonroad eng9es1    
includ+ d[ntime1 repair1 s]vice1        
logi/ics1 & equipm5t replacem5t co/s2   
7v7 ! ne$ = nationally consi/5t         
requirem5ts = su* nonroad vehicles &    
nonroad eng9es2 &  7vi7 ! effects ( !   
propos$ /&>d or o!r requirem5t on       
h>monization across su* nonroad vehicle 
& nonroad eng9e categories & eng9e      
families1 equipm5t models1 & %>$ eng9e  
or aft]treatm5t designs us$ across      
nonroad categories4  7#c7 ,rule (       
con/ruction ,no?+ 9 ?is subsection %all 
be con/ru$ to-- 7,a7 au?orize p]man5t   
disablem5t ( an emissions control sy/em2
  7,b7 exempt any nonroad vehicle or    
nonroad eng9e1 includ+ a nonroad        
compression-ignition eng9e & equipm5t   
conta9+ su* an eng9e1 f o!rwise         
applicable emission /&>ds promulgat$ "u 
?is title2 or  7,c7 prohibit !          
,adm9i/rator f approv+ s(tw>e updates1  
repair /rategies1 diagno/ic improvem5ts1
 or monitor+ approa*es implem5t$        

consi/5t ) o!rwise applicable           
c]tification requirem5ts & useful life  
requirem5ts "u ?is title4  7#d7         
,def9itions ,9 ?is subsection3 7,a7     
,cov]$ guidance docum5ts ,! t]m cov]$   
guidance docum5ts means--  7i7 !        
guidance entitl$ ,revis$ ,guidance =    
,light ,duty ,vehicles1 ,heavy-,duty    
,diesel ,eng9es & ,nonroad              
,compression-,ignition 7,,ci7 ,eng9es   
,us+ ,selective ,catalytic ,r$uction    
7,,scr7 ,te*nologies1 issu$ on ,augu/   
#aa1 #bjbe1 & designat$ z               
,,iacd-#bjbe-aj2  7ii7 ! guidance       
entitl$ ,cl>ification ,reg>d+ !         
,practice ( ,tempor>ily ,disabl+        
,aspects ( an ,emission ,control ,sy/em 
or ,compon5ts to ,repair or ,ma9ta9 a   
,nonroad ,eng9e1 issu$ ,janu>y #cj1     
#bjbf1 & designat$ ,,iacd-#bjbf-ja2 &   
7iii7 ! guidance entitl$ ,,def ,quality 
,monitor+ ,us+ ,alt]nate ,s5sor         
,te*nologies1 issu$ on ,m>* #bf1 #bjbf1 
& designat$ z ,,iacd-#bjbf-je4  7,b7    
,ti] #d /&>ds ,! t]m ,ti] #d /&>ds means

 ! /&>ds & associat$ c]tification &     
compliance requirem5ts "u p>ts #ajci &  
#ajfh ( title #dj1 ,code ( ,f$]al       
,regulations1 z 9 effect on ,janu>y #a1 
#bjbe4  4