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Chapter 9. Tire Pressure of California Health And Safety Code >> Division 26. >> Part 2. >> Chapter 9.

(a) For purposes of this chapter, "unsafe tire" means any tire considered unsafe in accordance with standard industry practices due to tire tread wear, tread irregularity, or damage. Examples include any tire with an exposed ply or cord, a sidewall crack, a bulge, a knot, or a ply separation.
  (b) For purposes of a regulation adopted pursuant to Division 25.5 (commencing with Section 38500) that requires an automotive service provider to check and inflate a vehicle's tires while performing automotive maintenance or repair service, a tire pressure gauge used by the provider to inflate a tire pursuant to that regulation shall be accurate within a range of plus or minus two pounds per square inch of pressure (2 psi).
  (c) An automotive service provider shall not be required to check and inflate a vehicle's tire pursuant to subdivision (b) if that tire is determined to be an unsafe tire.
  (d) This chapter shall remain in effect only until January 1, 2018, and as of that date is repealed, unless a later enacted statute, that is enacted before January 1, 2018, deletes or extends that date.