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Old 12-13-2012, 06:13 PM   #1 (permalink)
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Cat's done gone bad!

My car just hit 80k miles and one of the cats went bad. I've never had a car go through a cat that fast. Anyone have any ideas? 300c rwd

Thanks for the help guys!
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Old 12-13-2012, 06:20 PM   #2 (permalink)
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I've got my stock mids/cats for sale right now in the F/S threads.

Although I really wasn't planning on shipping them. And I'd rather not split them up if you are only looking for one.

If you want just one, you might be best off looking at a junk yard.

OR...... problems always make a good opportunity for an upgrade. High flow cats maybe??
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Old 12-13-2012, 06:45 PM   #3 (permalink)
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Check your emissions control components warranty.
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Old 12-13-2012, 07:25 PM   #4 (permalink)
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It was covered under the emissions warranty, just curious if anyone else has had their cat go out so soon.
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Old 12-14-2012, 03:06 AM   #5 (permalink)
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Are you getting a code? P0420/0430? 420 is the driver's side-430 passenger side. Catalyst efficiency below threshold. Remove the downstream O2 sensor on the side in question, and give it a good scrub with some fine sandpaper. Sometimes deposits on the sensor can trigger the code. It's worth a try to do that, or even replace the downstream O2 sensor, to see if it rectifies the problem, before looking for replacement cats, as they are expensive. You can also try this:


From the 2008 LX service manual:

"The catalyst monitor uses dual oxygen sensors (O2S's) to monitor the efficiency of the converter. The dual O2S's strategy is based on the fact that as a catalyst deteriorates, its oxygen storage capacity and its efficiency are both reduced. By monitoring the oxygen storage capacity of a catalyst, its efficiency can be indirectly calculated. The upstream O2S is used to detect the amount of oxygen in the exhaust gas before the gas enters the catalytic converter. The PCM calculates the A/F mixture from the output of the O2S. A low voltage indicates high oxygen content (lean mixture). A high voltage indicates a low content of oxygen (rich mixture).

When the upstream O2S detects a lean condition, there is an abundance of oxygen in the exhaust gas. A functioning converter would store this oxygen so it can use it for the oxidation of HC and CO. As the converter absorbs the oxygen, there will be a lack of oxygen downstream of the converter. The output of the downstream O2S will indicate limited activity in this condition.

As the converter loses the ability to store oxygen, the condition can be detected from the behavior of the downstream O2S. When the efficiency drops, no chemical reaction takes place. This means the concentration of oxygen will be the same downstream as upstream. The output voltage of the downstream O2S copies the voltage of the upstream sensor. The only difference is a time lag (seen by the PCM) between the switching of the O2S's.

To monitor the system, the number of lean-to-rich switches of upstream and downstream O2S's is counted. The ratio of downstream switches to upstream switches is used to determine whether the catalyst is operating properly. An effective catalyst will have fewer downstream switches than it has upstream switches i.e., a ratio closer to zero. For a totally ineffective catalyst, this ratio will be one-to-one, indicating that no oxidation occurs in the device.

The system must be monitored so that when catalyst efficiency deteriorates and exhaust emissions increase to over the legal limit, the MIL (Check Engine lamp) will be illuminated."
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Old 12-14-2012, 06:46 PM   #6 (permalink)
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We got the p0430 code. Dealer is replacing the cat under the emissions warranty. I'm guessing they checked the o2 sensors and determined them to be working. Either way we get a new cat, which will help when we move to California! Thanks for the replies guys. Can over filling with oil cause a condition that will deteriorate a cat conv?
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Old 12-15-2012, 05:19 AM   #7 (permalink)
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Quote:
Originally Posted by vyper883 View Post
Are you getting a code? P0420/0430? 420 is the driver's side-430 passenger side. Catalyst efficiency below threshold. Remove the downstream O2 sensor on the side in question, and give it a good scrub with some fine sandpaper. Sometimes deposits on the sensor can trigger the code. It's worth a try to do that, or even replace the downstream O2 sensor, to see if it rectifies the problem, before looking for replacement cats, as they are expensive. You can also try this:

Fixing Bad Catalytic Converters With Inefficiency Code P0420 - YouTube

From the 2008 LX service manual:

"The catalyst monitor uses dual oxygen sensors (O2S's) to monitor the efficiency of the converter. The dual O2S's strategy is based on the fact that as a catalyst deteriorates, its oxygen storage capacity and its efficiency are both reduced. By monitoring the oxygen storage capacity of a catalyst, its efficiency can be indirectly calculated. The upstream O2S is used to detect the amount of oxygen in the exhaust gas before the gas enters the catalytic converter. The PCM calculates the A/F mixture from the output of the O2S. A low voltage indicates high oxygen content (lean mixture). A high voltage indicates a low content of oxygen (rich mixture).

When the upstream O2S detects a lean condition, there is an abundance of oxygen in the exhaust gas. A functioning converter would store this oxygen so it can use it for the oxidation of HC and CO. As the converter absorbs the oxygen, there will be a lack of oxygen downstream of the converter. The output of the downstream O2S will indicate limited activity in this condition.

As the converter loses the ability to store oxygen, the condition can be detected from the behavior of the downstream O2S. When the efficiency drops, no chemical reaction takes place. This means the concentration of oxygen will be the same downstream as upstream. The output voltage of the downstream O2S copies the voltage of the upstream sensor. The only difference is a time lag (seen by the PCM) between the switching of the O2S's.

To monitor the system, the number of lean-to-rich switches of upstream and downstream O2S's is counted. The ratio of downstream switches to upstream switches is used to determine whether the catalyst is operating properly. An effective catalyst will have fewer downstream switches than it has upstream switches i.e., a ratio closer to zero. For a totally ineffective catalyst, this ratio will be one-to-one, indicating that no oxidation occurs in the device.

The system must be monitored so that when catalyst efficiency deteriorates and exhaust emissions increase to over the legal limit, the MIL (Check Engine lamp) will be illuminated."
Very useful and great video, thanks
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