loumazz
New Member
- Joined
- Jul 24, 2020
- Messages
- 4
I have a 2007 5.3L Avalanche, bought 3 months ago the repair shop has it more than me..uugh
141,700 miles on it, bought as is( my bad)
Day i took it home check engine light came on
P0420 and p0430 code it won't pass inspection so took it to a mechanic 1st thing he did was a full tune up spark plugs ect.. said that can throw the code..
Code came back ,
2nd time in, found a cheap China y pipe,
So put in a New California emissions Y pipe with new cats, 900. And new 02 sensor on bank 2 sensor 2, still p420 code,.
3rd time back New ECM and programed,
Still p420..
4th time back no answer yet..
On the code reader
Bank 2 sensor 2 looks perfect. .6 volts steady...
Than drops to .01 no volts..
Than up again fluctuating
Than 0 volts for awhile...
Than .6 steady perfect
HELP what can it be
New ecm ,new cats , new 02 sensor
Side note:
Bank 1 sensor 2 always .7 volts steady
So he swapped the sensors
The problem stayed on bank 2
141,700 miles on it, bought as is( my bad)
Day i took it home check engine light came on
P0420 and p0430 code it won't pass inspection so took it to a mechanic 1st thing he did was a full tune up spark plugs ect.. said that can throw the code..
Code came back ,
2nd time in, found a cheap China y pipe,
So put in a New California emissions Y pipe with new cats, 900. And new 02 sensor on bank 2 sensor 2, still p420 code,.
3rd time back New ECM and programed,
Still p420..
4th time back no answer yet..
On the code reader
Bank 2 sensor 2 looks perfect. .6 volts steady...
Than drops to .01 no volts..
Than up again fluctuating
Than 0 volts for awhile...
Than .6 steady perfect
HELP what can it be
New ecm ,new cats , new 02 sensor
Side note:
Bank 1 sensor 2 always .7 volts steady
So he swapped the sensors
The problem stayed on bank 2
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