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Virtual Wrench (L J)
Virtual Wrench (L J), Chevy Mechanic
Category: Chevy
Satisfied Customers: 13421
Experience:  35 years Master Mechanic
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1999 chevy suburban p0430 code showing low effiecintcy below

Resolved Question:

1999 chevy suburban p0430 code showing low effiecintcy below threshold catalyst system bank 2,thats passenger side manifold ? replaced both o2 sensors sel still comes back on?
Submitted: 4 years ago.
Category: Chevy
Expert:  Virtual Wrench (L J) replied 4 years ago.

Hello,

 

Is that the only code coming up?

Customer: replied 4 years ago.
yes thats the only code coming up
Expert:  Virtual Wrench (L J) replied 4 years ago.

Thanks!

 

In all the cases we have found the cat converter to be the cause of this. Make sure to replace it with an OEM unit. I have included the technical info on that code for you to read. Click here to download it.

 

Thanks for asking!

 

 

 

 

Customer: replied 4 years ago.

before this code came up a week ago had a missfire it was a bad distributor cap thougt it was bad gas then added a fuel conditiner then that code came up then replaced o2 sensors on passenger side code still shows up after driving 10 miles

 

Expert:  Virtual Wrench (L J) replied 4 years ago.

Hi,

 

The combination of the misfire and the additive is most likely why the code is set. You can try disconnecting both battery cables and touch them together for 10 seconds then reconnect them. This will reset the computer and hopefully the light will stay off. If not, then the converter will need replaced.

 

Best of luck my friend!

Virtual Wrench (L J), Chevy Mechanic
Category: Chevy
Satisfied Customers: 13421
Experience: 35 years Master Mechanic
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Virtual Wrench (L J)
Virtual Wrench (L J)
Chevy Mechanic
13421 Satisfied Customers
35 years Master Mechanic