Bank 2 sensor 1 problem
#1
10-29-2018, 12:18 AM
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Bank 2 sensor 1 problem
I have 2008 Infiniti g35s my check engine light is on says (bank 2 sensor 1) I bought from dealer and replaced but after 100 miles the check engine light is coming back on i changed 3 times already but the light still coming back on. Please help me with this problem. What's the problem on it????
#3
10-29-2018, 03:28 PM
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#4
11-02-2018, 01:18 PM
Are you getting the P2A00/04 code? I dealt with that recently too.
Before you replace any more sensors, check for cracks in the exhaust, it's a known issue with these cars. There is a bracket that both catalytic converters bolt to, near the downstream O2 sensors. Both cats have welded tabs that bolt to this bracket, and it's common to find cracks around these welds. The cracks can allow fresh air in to the exhaust which causes readings the computer thinks are out of range.
In my case, I started getting the P2A00 code (bank 1) frequently, and was able to resolve it by welding up the crack in the exhaust. I did have to cut/bend a small section of the heat shield out of the way for access.
It surprised me that a crack down near sensor 2 was able to throw a code for sensor 1, but the results are pretty clear. No more codes for me in the past month, where it happened every drive before fixing the cracked exhaust.
Before you replace any more sensors, check for cracks in the exhaust, it's a known issue with these cars. There is a bracket that both catalytic converters bolt to, near the downstream O2 sensors. Both cats have welded tabs that bolt to this bracket, and it's common to find cracks around these welds. The cracks can allow fresh air in to the exhaust which causes readings the computer thinks are out of range.
In my case, I started getting the P2A00 code (bank 1) frequently, and was able to resolve it by welding up the crack in the exhaust. I did have to cut/bend a small section of the heat shield out of the way for access.
It surprised me that a crack down near sensor 2 was able to throw a code for sensor 1, but the results are pretty clear. No more codes for me in the past month, where it happened every drive before fixing the cracked exhaust.
#5
11-21-2018, 03:21 AM
He’s right about checking your exhaust system for cracks.
I recently chased this code down and it drove me nuts. Then I realized I ran over a small rock on the road (dropped car + embankment on the right + oncoming car on the left = run it over and pray!) and I’d figure I’d take a look see.
Sure enough I found a crack. And as ridiculous as it seems because it’s so small, once I welded it, the code disappeared and never came back. Check your cats, near the mounting bolts especially. I’ll attach a pic of what mine looked like and so you can see just how small of a crack can throw off our sensitive electronics.
edit:
why cant my phone upload the image??
I recently chased this code down and it drove me nuts. Then I realized I ran over a small rock on the road (dropped car + embankment on the right + oncoming car on the left = run it over and pray!) and I’d figure I’d take a look see.
Sure enough I found a crack. And as ridiculous as it seems because it’s so small, once I welded it, the code disappeared and never came back. Check your cats, near the mounting bolts especially. I’ll attach a pic of what mine looked like and so you can see just how small of a crack can throw off our sensitive electronics.
edit:
why cant my phone upload the image??
Last edited by alwaysHI; 12-03-2018 at 02:23 AM.
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