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Old 26 Dec 2012, 03:31 pm
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Default Took 1999 honda civic to mechanic check engine light on.said to replace cat AND torque i do both? Will changing just the catalyc converter turn the check engine light off?
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Old 26 Dec 2012, 03:49 pm
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yeah just replace the cat converter

torque converter is aftermarket
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Old 26 Dec 2012, 04:02 pm
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Go see another mechanic and get a second opinion before you have any work done. Catalytic converters are made to last the life of the car and if they fail, the cause needs to be identified and fixed otherwise the new cat will fail also. As far as the torque converter, that sounds like complete bull **** to me, that wouldn't trigger a check engine light. It sounds like they're trying to sell you a new transmission that you don't need.

You can also take the car to a chain parts store like Autozone and they will use a scanner to read the codes for free, and tell you what they are.
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Old 26 Dec 2012, 04:17 pm
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All automatic transmission cars have torque converters from the factory. If your car is driving OK and you have no symptoms other than the check engine light, I dont think you need to do more than the cat.
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Old 26 Dec 2012, 04:31 pm
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The fact the mechanic said torque converter would make me believe that you need a different mechanic. The torque converter is in the transmission. If the car is shifting poorly or not at all, then yes, it could be the torque converter. However, a check engine light has nothing to do with that. A check engine light could mean any of the following things:

Bad fuel cap

Bad fuel filter

Bad 02 sensors

Bad catalytic converter (usually meaning 02 sensor may or may not need replacing too)

Valve adjustment (DX and LX Civics need periodical valve adjustments)

EGR could be dirty (usually can be cleaned) or it might need replacement

A tuneup oftentimes causes check engine light to come on

Bad headgasket

Usually, it's not the head gasket and usually is emissions related (EGR, catlytic converter and/ or 02 sensor). Take it to a different mechanic and get a diagnostic ran on your car. That will tell you the problem
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