EXHIBIT 23(b) CONSENT OF INDEPENDENT AUDITORS We consent to the reference to our firm under the caption "Experts" in Amendment No. 1 to the Registration Statement (Form S-4 No. 333-74275) and related Prospectus of United Rentals (North America), Inc. and to the incorporation by reference therein of our report dated February 17, 1999, with respect to the consolidated financial statements of United Rentals (North America), Inc. included in its Annual Report (Form 10-K) for the year ended December 31, 1998, our report dated January 23, 1998 with respect to financial statements of Mission Valley Rentals, Inc. included in the Company's Current Report on Form 8-K/A dated February 4, 1998; and our report dated June 24, 1998, with respect to the financial statements of Power Rental Co., Inc. included in the Company's Current Report on Form 8-K/A dated July 21, 1998 and in the Company's Current Report on Form 8-K dated December 24, 1998, filed with the Securities and Exchange Commission. /s/ Ernst & Young LLP MetroPark, New Jersey May 7, 1999