EXHIBIT 12
TENNECO AUTOMOTIVE INC. AND CONSOLIDATED SUBSIDIARIES
COMBINED WITH 50% OWNED UNCONSOLIDATED SUBSIDIARIES
COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
<Table>
<Caption>
AS ADJUSTED
---------------------------------
YEARS ENDED DECEMBER 31,
---------------------------------
2004 2003 2002 2001 2000
---- ---- ---- ----- ----
(DOLLARS IN MILLIONS)
Income (loss) before cumulative effect of change in
accounting principle................................... $ 15 $ 26 $ 31 $(131) $(41)
Add:
Interest expense....................................... 179 149 141 170 188
Portion of rentals representative of the interest
factor.............................................. 11 11 11 10 13
Income tax expense (benefit) and other taxes on
income.............................................. (24) (7) (7) 50 (27)
Minority interest...................................... 4 6 4 -- --
Amortization of interest capitalized................... 1 1 1 1 --
Undistributed losses of affiliated companies in which
in less than a 50% voting interest is owned......... -- 2 2 1 --
---- ---- ---- ----- ----
Earnings as defined................................. $186 $188 $183 $ 101 $133
==== ==== ==== ===== ====
Interest expense......................................... $179 $149 $141 $ 170 $188
Interest capitalized..................................... 2 4 4 3 6
Portion of rentals representative of the interest
factor................................................. 11 11 11 10 13
---- ---- ---- ----- ----
Fixed charges as defined............................ $192 $164 $156 $ 183 $207
==== ==== ==== ===== ====
Ratio of earnings to fixed charges....................... 0.97 1.15 1.17 0.55 0.64
==== ==== ==== ===== ====
</Table>
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NOTE: Earnings were inadequate to cover fixed charges by $6 million, $82
million, and $74 million for the years ended December 31, 2004, 2001 and
2000, respectively.
See Note 4 to the consolidated financial statements included herein for further
information.