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,
------------
2005 2004
---- ----
Net income.................................................. $ 40 $ 28
Add:
Interest expense.......................................... 64 69
Amortization of capitalized interest...................... 1 1
Portion of rentals representative of the interest
factor................................................. 6 5
Income tax expense and other taxes on income.............. 22 9
Minority interest......................................... 1 3
Undistributed (earnings) losses of affiliated companies in
which less than a 50% voting interest is owned......... (1) --
---- ----
Earnings as defined.................................... $133 $115
==== ====
Interest expense............................................ $ 64 $ 69
Interest capitalized........................................ 1 1
Portion of rentals representative of the interest factor.... 6 5
---- ----
Fixed charges as defined............................... $ 71 $ 75
==== ====
Ratio of earnings to fixed charges.......................... 1.87 1.53
==== ====
</Table>