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The Pennsylvania Code website reflects the Pennsylvania Code changes effective through 52 Pa.B. 3204 (May 28, 2022).

67 Pa. Code § 177.204. Basis for failure.

§ 177.204. Basis for failure.

 The basis for failure of the tests and procedures under this chapter shall be as follows:

   (1)  I/M emission test. A vehicle fails the I/M emission test if emissions exceed the following standards:

     (i)   Idle test standards.

       (A)   Passenger cars and trucks less than 6,000 pounds GVWR.

1975-1979 4.0 400
1980 3.0 300
1981-1992 1.2 220
1993 and newer 1.0 130

       (B)   Trucks 6,000 pounds through 9,000 pounds GVWR.

1975-1978 6.0 650
1979 4.0 400
1980 3.0 300
1981-1992 1.2 220
1993 and newer 1.0 180

       (C)   Maximum exhaust dilution shall be measured as at least 6% CO plus CO2 on vehicles subject to a steady-state test as described in 40 CFR Part 51, Subpart S, Appendix B (relating to test procedures), which is adopted by reference.

     (ii)   ASM test emission standards. Model years 1981 and newer vehicles required to receive an ASM emission inspection shall be subject to standards specified in Appendix A (relating to acceleration simulation mode: Pennsylvania procedures, standards, equipment specifications and quality control requirements).

   (2)  OBD-I/M check.

     (i)   Unless otherwise noted, a vehicle fails the OBD-I/M check for any of the following:

       (A)   The MIL does not illuminate at all when the ignition key is turned to the KOEO position.

       (B)   The DLC is missing, has been tampered with, is otherwise inoperable or is inaccessible.

       (C)   The vehicle displays more than the requisite number of readiness codes as ‘‘not ready,’’ ‘‘not supported’’ or similar message under §  177.203(b)(1)(i)—(iii) (relating to test procedures), and there is no justification under §  177.203(b)(1)(iv) for disregard of the readiness requirement.

       (D)   The MIL illuminates continuously or flashes while the engine is running, even if no DTCs are present. If this condition is present, the vehicle shall fail under this paragraph, not subparagraph (ii), even if the MIL did not illuminate in the KOEO position.

       (E)   Any DTCs are present and the MIL status, as indicated by the scan tool, is commanded on, regardless of whether or not the MIL is actually illuminated.

     (ii)   During the first test cycle of emission inspection utilizing the OBD-I/M check in an I/M county or region, the inability to locate or access a vehicle’s DLC shall not be a basis for failure, provided that the MIL illuminates when the ignition key is in the KOEO position and does not illuminate continuously or flash while the engine is running.

   (3)  Evaporative emission system function test (gas cap test) standards. A vehicle shall fail the gas cap test if at any time during the gas cap test the pressure drops from the starting pressure by more than 6 inches of water, causing the test to be terminated. If the pressure does not drop more than 6 inches during the test, the vehicle shall pass the gas cap test.

   (4)  Visual inspection of vehicle emission control system. A vehicle shall fail the visual inspection if applicable required emission control equipment specified in §  177.203(d) is not present, is not properly connected or is not the correct type for the certified configuration.

   (5)  Subsequent test procedures and bases for failure approved by the EPA. If the EPA develops or approves other test procedures and bases for failure of test procedures, including the test procedures prescribed in this section, the Department may adopt these subsequently approved test procedures and bases for failure consistent with section 4706(e) of the Vehicle Code (relating to prohibition on expenditures for emission inspection program).


   The provisions of this §  177.204 amended November 21, 2003, effective November 22, 2003, 33 Pa.B. 5706. Immediately preceding text appears at serial pages (235270) to (235272).

Cross References

   This section cited in 67 Pa. Code §  177.3 (relating to definitions); 67 Pa. Code §  177.51 (relating to program requirements); 67 Pa. Code §  177.203 (relating to test procedures); and 67 Pa. Code §  177.406 (relating to equipment).

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