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,
---------------------------------
2003 2002 2001 2000 1999
---- ---- ----- ---- ----
(DOLLARS IN MILLIONS)
Income (loss) from continuing operations before
cumulative effect of change in accounting principle.... $ 27 $ 31 $(130) $(42) $(81)
Add:
Interest expense....................................... 149 141 170 188 134
Portion of rentals representative of the interest
factor.............................................. 11 11 10 13 11
Preferred stock dividend requirements of majority-owned
subsidiaries........................................ -- -- -- -- 22
Income tax expense (benefit) and other taxes on
income.............................................. (6) (7) 51 (28) 72
Minority interest...................................... 6 4 -- -- --
Amortization of interest capitalized................... 1 1 1 -- --
Undistributed losses of affiliated companies in which
less than a 50% voting interest is owned............ 2 2 1 -- --
---- ---- ----- ---- ----
Earnings as defined................................. $190 $183 $ 103 $131 $158
==== ==== ===== ==== ====
Interest expense......................................... $149 $141 $ 170 $188 $134
Interest capitalized..................................... 4 4 3 6 --
Portion of rentals representative of the interest
factor................................................. 11 11 10 13 11
Preferred stock dividend requirements of majority-owned
subsidiaries on a pre-tax basis........................ -- -- -- -- 35
---- ---- ----- ---- ----
Fixed charges as defined............................ $164 $156 $ 183 $207 $180
==== ==== ===== ==== ====
Ratio of earnings to fixed charges....................... 1.16 1.17 .56 .63 .88
==== ==== ===== ==== ====
</Table>