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CG-DL-E-07022026-269923
EXTRAORDINARY
PART II—Section 3—Sub-section (i)
833 GI/2026
(1)
MINISTRY OF ROAD TRANSPORT AND HIGHWAYS
NOTIFICATION
New Delhi, the 4th February, 2026
G.S.R. 112(E).—Whereas, the draft rules further to amend the Central Motor Vehicles Rules, 1989 were
published, as required under sub-section (1) of section 212 of the Motor Vehicles Act, 1988 (59 of 1988), vide
notification of the Government of India in the Ministry of Road Transport and Highways vide number G.S.R 270 (E),
dated the 28th April, 2025 in the Gazette of India, Extraordinary, Part II, Section (3), Sub-section (i), inviting
objections and suggestions from all persons likely to be affected thereby before the expiry of the period of thirty days
from the date on which copies of the Gazette containing the said notification were made available to the public;
And whereas copies of the said Gazette notification was made available to the public on 29th April, 2025;
And whereas the objections and suggestions received from the public in respect of the said draft rules have
been considered by the Central Government.
Now, therefore, in exercise of the powers conferred by section 110 of the Motor Vehicles Act, 1988 (59 of
1988), the Central Government hereby makes the following rules further to amend the Central Motor Vehicles Rules,
1989, namely:-
1. Short title and commencement. — (1) These rules may be called as the Central Motor Vehicles (Fourth
Amendment) Rules, 2026.
(2) Save as otherwise provided in these rules, they shall come into force on the date of their publication in the Official
Gazette.
2. In the Central Motor Vehicles Rules, 1989, (hereinafter referred to as the said rules), in rule 115,-
(a) in-sub-rule (2), in clause (i), in TABLE A, in Note, in second proviso, after the words, letters and figures, “TAP
documents Nos. 115 and 116 or AIS-137” the letters and figures “or AIS-175” shall be inserted;
(b) in sub-rule (18), after clauses (i), the following clause shall be inserted, namely:-
“(iA) The Emission Standards for Bharat Stage VI (BS-VI) with Worldwide Harmonized Light duty
Test Procedure (WLTP) test cycle: The emission standards for vehicles of category M2 with Gross Vehicle
Weight (GVW) not exceeding 3500kg and for vehicles of category M1, manufactured on or after 1st April
2027 for all models, shall be as under:-
TABLE 1
Exhaust Emission Limits for Vehicles Fitted with PI and CI Internal Combustion Engines: (BS-VI) WLTP
| Category | Class | Reference Mass (RM)(2) (kg) | Mass of carbon mon oxide - (CO) | | Mass of total hydro carbons - (THC) | | Mass of nonmethane hydrocarbons (NMHC) | | Mass of oxides of nitrogen - (NOx) | | Combined mass of total hydrocarbons and oxides of nitrogen (THC + NOx) | | Mass of particulate matter (PM) | | Number of particles (PN) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| | | | L 1 (mg/km) | | L 2 (mg/km) | | L (mg/km) 3 | | L 4 (mg/km) | | L2 + L4 (mg/km) | | L (mg/km) 5 | | L (#/km) 6 | |
| | | | PI | CI | PI | CI | PI | CI | PI | CI | PI | CI | PI (1) | CI | PI (1) | CI |
| M | - | All | 1000 | 500 | 100 | - | 68 | - | 60 | 80 | - | 170 | 4.5 | 4.5 | 6x1011 | 6x1011 |
PI = Positive Ignition, CI = Compression Ignition
1. For positive ignition, particulate mass and number of particles limit shall apply only to vehicles with Direct
Injection engines.
2. "Reference mass" means the vehicle’s mass in running order less the uniform mass of the driver of 75 kg and
increased by a uniform mass of 100 kg.
Application of Test Requirements for Type-Approval – BS-VI, with WLTP test procedures, shall be same as that of
Table 2 of rule 115 (18) (i) including explanatory note (1) to (5) only.
Notes. -
1. The test shall be on Chassis Dynamometer.
2. The test procedure including driving cycle shall be as provided in AIS-175 as amended from time to time.
3. There shall be no relaxation of norms for Conformity of Production (COP) purposes and procedure for
compliance shall be as per AIS-175 as amended from time to time.
4. Specifications for Reference Fuels shall be same as that of Note 4 of rule 115(18)(i).
5. Crankcase ventilation system shall not permit the emission of any of the crankcase gases into the
atmosphere.
6. Evaporative emission shall not be more than 2.0g/test from Gasoline fuelled vehicles. The evaporative
emission test procedure for gasoline fuelled vehicles shall be as per the procedure specified in AIS-175 and
as amended from time to time.
7. The Conformity of Production (COP) testing procedure shall be as described in AIS-175 and as amended
from time to time.
8. Conformity of Production (COP) frequency and samples shall be same as that Note 8 of rule 115(18)(i).
9. Specifications for Commercial Fuels shall be same as that note 9 of rule 115(18)(i).
10. Specifications of NOx reduction agent AUS 32 (Aqueous Urea Solution) shall be same as that of Note 10 of
rule 115 (18) (i).
11. For diesel vehicles, the requirements for the emission of visible pollutants (smoke) shall be same as that of
Note 11 of rule 115 (18) (i).
12. The engine power shall be measured on engine dynamometer and the procedure and requirements for the
measured power shall be same as that of Note 12 of rule 115 (18) (i).
13. Type-II Test: Vehicles fitted with PI engines specified in this sub-clause shall comply with the provisions of
clause (i) of sub-rule (2) of rule 115 as applicable.
14. Free Acceleration Smoke: Vehicles fitted with CI engines specified in this sub-clause shall comply with the
provisions of clause (ii) of sub-rule (2) of rule 115 as applicable.
15. Deterioration Factor shall be as given in the following Table: -
Table 2
Deterioration Factor: (BS-VI) WLTP
| Sl. No. | Engine Category | Assigned Deterioration Factor | | | | | | |
|---|---|---|---|---|---|---|---|---|
| | | CO | THC | NMHC | NOx | HC+NOx | Particulate Matter (PM) | Particle Number (PN) |
| | (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) |
| (1) | Positive Ignition | 1.5 | 1.3 | 1.3 | 1.6 | - | 1.0 | 1.0 |
| (2) | Compression Ignition | Deterioration Factors shall be established by using the whole vehicle or bench ageing durability test procedures as per AIS-175 as amended from time to time. | | | | | | |
(i) Alternatively, for PI vehicles, the vehicle manufacturer may opt for a vehicle ageing test of 1,60,000 km or
bench ageing durability test, for evaluating the Deterioration factor as per AIS-175 and as amended from
time to time.
(ii) This test may be performed by driving vehicle on a test track, on the road, or on a chassis dynamometer or
Engine Test Bench as per AIS-175 and as amended from time to time
(iii) The above ageing test should be carried out by the approved test agency specified in rule 126.
16. The vehicles shall be equipped with On-Board Diagnostic (BS- VI WLTP - OBD) systems for emission control
which shall have the capability of identifying the likely area of malfunction by means of fault codes stored in
computer memory as per the procedure laid down in AIS-175 and as amended from time to time when that failure
results in an increase in emission above the limits given in the following Table, namely:-
Table 3
On-Board Diagnostic (OBD) Threshold for vehicles: BS-VI WLTP
| Sl. No. | | | Reference mass (RM) (2) (kg) | CO (mg/km) | | NMHC/ (mg/km) | | NOx (mg/km) | | PM (mg/km) | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| | (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) |
| (1) | Category | Class | | PI | CI | PI | CI | PI | CI | PI (1) | CI |
| (2) | M (M1 & M2) | - | All | 1900 | 1750 | 170 | 290 | 90 | 140 | 12 | 12 |
| | Explanatory Notes to Superscript- (1)For positive ignition, particulate mass apply only to vehicles with direct injection engines (2) Reference mass" means the vehicle’s mass in running order less the uniform mass of the driver of 75 kg and increased by a uniform mass of 100 kg. | | | | | | | | | | |
17. In-use performance ratio (IUPR) for BS-VI WLTP vehicles complying to these rules, the in-use performance ratio
(IUPR) of a specific monitor M of the OBD systems shall be:
IUPRM = Numerator/ Denominator
(i) Comparison of Numerator and Denominator gives an indication of how often a specific monitor is operating
relative to vehicle operation. Detailed requirements for tracking IUPR are given in AIS-175.
(ii) If, according to the requirements specified in AIS-175, the vehicle is equipped with a specific monitor M,
IUPRM shall be greater or equal to the following minimum values.
(a) 0.520 for evaporative emission purge control monitors.
(b) 0.336 for all other monitors.
(c) 0.260 for secondary air system monitors and other cold start related monitors.
18. In service compliance of vehicles shall be as per procedure laid down in AIS-175 and as amended time to time.
19. For the vehicles complying to these Rules, Real world driving cycle emission measurement using PEMS shall be
carried out for vehicles as per the procedure laid down in AIS-175 as amended from time to time, for all models
during Type Approval. The RDE Conformity Factor (CF), shall be as per following Table namely:-
Table 4
Conformity Factor (CF) : BS-VI WLTP
| Sl. No. | Pollutant | CFpollutant |
|---|---|---|
| | (1) | (2) |
| (1) | NOx | 1 + margin (3) NOx With margin NOx = 0.43 |
| (2) | PN (1) | 1 + margin (3) PN With margin PN = 0.5 |
| (3) | CO (2) | - |
| Explanatory Notes to Superscripts- (1) Applicable for: Positive Ignition (Direct Injection) engines and Compression Ignition Engines only; (2) CO emissions shall be measured and recorded at RDE tests; (3) Margin is a parameter taking into account considering the additional measurement uncertainties introduced by the PEMS equipment. | | |
20. The CNG or Bio-CNG or HCNG Vehicles shall meet all the safety requirements as per AIS 024, AIS-028
Revision 1 as applicable.
21. The compatibility of vehicle to the level of Ethanol blend of E85 and E100 shall be defined by the vehicle
manufacturer and the same shall be displayed on the vehicle by putting a clearly visible sticker as per AIS 171:2021.
22. All the Gasoline fuelled Mono Fuel and Bi-Fuel Vehicles with Positive Ignition Engines including Hybrids shall
be certified with Ethanol (E20) fuel.”.
3. In the said rules, in rule 115-G, for sub-rule (2), the following sub-rule shall be substituted, namely: -
“(2) The procedure for ensuring compliance under sub-rule (1) shall be as laid down in Document No.
MoRTH/CMVR/TAP-115/116 or AIS-137, as amended from time to time. On and after the AIS-175 is notified, the
procedure for ensuring compliance under sub-rule (1) shall be as laid down in AIS-175 as amended from time to time
as mentioned under the corresponding applicable rules.”.
[F. No. RT-11036/25/2025-MVL]
MAHMOOD AHMED, Addl. Secy.
Note: The principal rules were published in the Gazette of India, Extraordinary, Part II, Section 3, sub-section(i) vide
G.S.R. 590(E), dated the 2nd June, 1989 and lastly amended vide G.S.R. 48 (E) dated the 20th January, 2026.
and Published by the Controller of Publications, Delhi-110054.
Date: 2026.02.07 11:29:42 +05'30'
GORAKHA NATH YADAVA
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