EXHIBIT 12
TENNECO AUTOMOTIVE INC. AND CONSOLIDATED SUBSIDIARIES
COMBINED WITH 50% OWNED UNCONSOLIDATED SUBSIDIARIES
COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
(DOLLARS IN MILLIONS)
(UNAUDITED)
<Table>
<Caption>
SIX MONTHS
ENDED
JUNE 30,
--------------
2004 2003
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Net income.................................................. $ 28 $ 25
Add:
Interest expense.......................................... 69 69
Amortization of interest capitalized...................... 1 1
Portion of rentals representative of the interest
factor................................................. 5 5
Income tax benefit and other taxes on income.............. 9 1
Minority interest......................................... 3 3
Undistributed (earnings) losses of affiliated companies in
which less than a 50% voting interest is owned......... -- 2
----- -----
Earnings as defined.................................... $ 115 $ 106
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Interest expense............................................ $ 69 $ 69
Interest capitalized........................................ 1 2
Portion of rentals representative of the interest factor.... 5 5
----- -----
Fixed charges as defined............................... $ 75 $ 76
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Ratio of earnings to fixed charges.......................... 1.53 1.39
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</Table>