Check Engine Light
#21
Contributing Member
P0420 is almost always a bad cat. You can check your o2 sensors with a scan tool and they should "toggle". On average, the front o2 sensor will toggle between roughly 100 to 800 hertz. The rear will toggle far less say.... 100-300 hertz. If your cat is working properly that is. If your cat in inefficient, your rear o2 sensor will nearly match your front o2 sensor, indicating no change, or that your cat is not working properly. You can also take a temperature reading of the cat. There should be roughly a 50 degree difference between the inlet and outlet temperature of the cat.
On the whole, before replacing your cat, make sure your engine doesn't have any other driveability/runability problems. Make sure your engine goes into closed loop, isn't running rich, etc, etc. If all that check out, 9 times out of 10 it's a bad cat.
-Wrench
On the whole, before replacing your cat, make sure your engine doesn't have any other driveability/runability problems. Make sure your engine goes into closed loop, isn't running rich, etc, etc. If all that check out, 9 times out of 10 it's a bad cat.
-Wrench
#23
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Join Date: Nov 2003
Location: Incline Village, NV
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hey all, just wondering, 8 years or 80k miles? i have a 97 with 120k on it, i'm under 8 years, but what about the 80k? kind of don't understand this concept of warranty, any help, i know i'm a buffoon, it's all the altitude here in tahoe. -dd
#25
Contributing Member
Originally Posted by WATRD
Whichever is less. Think of it as "Less than eight years AND less than 80k miles". If you go over either limit, the coverage expires.
#26
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thanks guys, my code was p0133 - o2 sensor ckt, slow response (bank 1 sensor 1). so...luckily i believe it's my front o2 sensor bank, will replace soon. thanks for all the help, dd
#27
Contributing Member
Originally Posted by dirk diggler
thanks guys, my code was p0133 - o2 sensor ckt, slow response (bank 1 sensor 1). so...luckily i believe it's my front o2 sensor bank, will replace soon. thanks for all the help, dd
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