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Can bad gas or a loose gas cap cause a P0420 (Cat failure)?

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Old 01-31-2010, 12:12 AM
Mustang_Cougar Mustang_Cougar is offline
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Default Can bad gas or a loose gas cap cause a P0420 (Cat failure)?

Hi.

I've got a '97 Grand Caravan 3.3l w/160k miles which I've owned for about six months. I haven't had any issues/problems with it, but then in the last 24 hours the following "weird" things have occurred:

1) My turn signals & emergency flashers quit working. Though I was planning to pull the signal relay to check it, the problem went away and didn't come back (I've put about 75 miles on the van, various start/stops & everything is working fine).

2) Threw a "Service Engine Soon" warning w/code P0420. The light came on when I slowed to ~30mph, after a 20 minute highway drive at ~60mph. The only "out of the ordinary" thing I've done recently is fill the tank today at a "so-so" gas station (the tank was almost empty). Though I normally tighten the gas cap 'til it clicks, I did go ahead and re-tighten it after the code appeared.

Is there a snow-*****' chance these two things are electrically related? I don't see how they could be...PCM is engine control, intermittent turn signals is a relay/fuse box problem. But since both issues occurred in close proximity to each other, I thought I'd ask. Also, can a loose gas cap or cruddy gas cause a P0420? I know that code almost always results in a cat replacement, but I haven't noticed any rough idle, loss of power or hesitation issues; I also passed an emissions test in September.

Thanks for any help!

M_C
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Old 01-31-2010, 12:26 AM
Mustang_Cougar Mustang_Cougar is offline
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And one other thing: I also got a 12 MIL code...even though I haven't disconnected the battery within the last 50 key-on cycles.
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Old 01-31-2010, 01:18 AM
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Yes bad gas can be a problem with any car. No the gas cap will give a evap code like P455. o2 sensor can also give you the P0420 code too.
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Old 01-31-2010, 06:52 AM
92dak5.24x4 92dak5.24x4 is offline
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my sources say 255 key cycles for 12 to disappear but still who cares, it lets you know that the diagnostic system is starting up and working
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Old 01-31-2010, 06:52 AM
 
 
 
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