EXHIBIT 12
TENNECO AUTOMOTIVE INC. AND CONSOLIDATED SUBSIDIARIES
COMBINED WITH 50% OWNED UNCONSOLIDATED SUBSIDIARIES
COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
<Table>
<Caption>
YEARS ENDED DECEMBER 31,
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2002 2001 2000 1999 1998
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(DOLLARS IN MILLIONS)
Net income (loss) before extraordinary loss and
cumulative effect of change in accounting
principle............................................ $ 31 $(130) $(41) $ (63) $ 116
Add:
Interest expense..................................... 141 170 186 106 69
Portion of rentals representative of the interest
factor............................................ 11 10 13 11 10
Preferred stock dividend requirements of majority-owned
subsidiaries......................................... -- -- -- 22 27
Income tax expense (benefit) and other taxes on
income............................................ (7) 51 (27) 82 13
Minority interest.................................... 4 -- -- -- --
Amortization of interest capitalized................. 1 1 -- -- --
Undistributed losses of affiliated companies in which
less than a 50% voting interest is owned.......... 2 1 -- -- --
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Earnings as defined.......................... $ 183 $ 103 $131 $ 158 $ 235
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Interest expense....................................... $ 141 $ 170 $186 $ 106 $ 69
Interest capitalized................................... 4 3 6 -- --
Portion of rentals representative of the interest
factor............................................... 11 10 13 11 10
Preferred stock dividend requirements of majority-owned
subsidiaries on a pre-tax basis...................... -- -- -- 35 30
----- ----- ---- ----- -----
Fixed charges as defined..................... $ 156 $ 183 $205 $ 152 $ 109
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Ratio of earnings to fixed charges..................... 1.17 .56 .64 1.04 2.16
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</Table>