 mattmagPremium,ExMod 2000-03
join:2000-04-09
NW Illinois
kudos:3 | reply to Anonymous_
Re: catalytic converter? P0240 said by Anonymous_:If it was the catalytic converter I would be getting more codes besides the P0420
What makes you think that? Your assumption in this case is wrong. P0420 is very often a stand-alone code, and requires no other associated failures to enable it. |
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 Anonymous_AnonymousPremium
join:2004-06-21
127.0.0.1
kudos:2 | I was behind a bus that was pouring out a lot of smoke, when the CEL came on. |
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mattmagPremium,ExMod 2000-03
join:2000-04-09
NW Illinois
kudos:3
1 edit | said by Anonymous_:I was behind a bus that was pouring out a lot of smoke, when the CEL came on.
You were behind a smoking bus *twice* to make it come on? You said you already had the code cleared once. And, that's a virtually impossible scenario to cause that code anyway.
What sensor do you plan on replacing on a blind guess? Upstream or downstream? I really don't understand why people want to come up with every reason under the sun why this code sets. There is a converter failure code so you want to replace the oxygen sensor. If a code sets for an cylinder #4 misfire, are you going to replace a headlamp?
I'm being straight here--- BOTH related-bank oxygen sensors MUST BE operating properly for this failure code to occur. The computer is measuring exhaust oxygen content BOTH before AND after the catalyst to determine its efficiency. A malfunctioning O2 sensor strictly prevents this diagnostic cycle from running, and will set a SENSOR failure code, NOT a catalyst code. There are no "false positives" here.
I will add that the best course of repair is proper diagnosis. Get the system tested, preferably by a shop that can scope the components to get the correct picture. Like I said, very high percentage its the converter. Oxygen sensor failure is very rare. |
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Anonymous_AnonymousPremium
join:2004-06-21
127.0.0.1
kudos:2 Reviews:
 ·RoadRunner Cable
| said by mattmag:said by Anonymous_:I was behind a bus that was pouring out a lot of smoke, when the CEL came on.
You were behind a smoking bus *twice* to make it come on? You said you already had the code cleared once. And, that's a virtually impossible scenario to cause that code anyway. What sensor do you plan on replacing on a blind guess? Upstream or downstream? I really don't understand why people want to come up with every reason under the sun why this code sets. There is a converter failure code so you want to replace the oxygen sensor. If a code sets for an cylinder #4 misfire, are you going to replace a headlamp? I'm being straight here--- BOTH related-bank oxygen sensors MUST BE operating properly for this failure code to occur. The computer is measuring exhaust oxygen content BOTH before AND after the catalyst to determine its efficiency. A malfunctioning O2 sensor strictly prevents this diagnostic cycle from running, and will set a SENSOR failure code, NOT a catalyst code. There are no "false positives" here. I will add that the best course of repair is proper diagnosis. Get the system tested, preferably by a shop that can scope the components to get the correct picture. Like I said, very high percentage its the converter. Oxygen sensor failure is very rare. I'll just wait tell I need to do the smog test (you bet I going to clear the code before I get the test done)
if it passes then it's a faulty SENSOR. if it fails I get it fixed
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Well, does your car at least turn into something else? Sometimes I turn it into a trashcan. Hmm... |
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| reply to mattmag
said by mattmag:said by Anonymous_:If it was the catalytic converter I would be getting more codes besides the P0420
What makes you think that? Your assumption in this case is wrong. P0420 is very often a stand-alone code, and requires no other associated failures to enable it. exactly, like i just posted, faulty cats threw that code on my both grand prix. same car as the impala, and those were the only codes i had |
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