Code P2270
07-09-2008, 08:04 PM
#1
Thread Starter
Join Date: Jul 2008
Posts: 12
Code P2270
First off let me start off by saying hi, just signed up to this forum as my son just came back home to Oklahoma and brought with him his '04 GT. Anyway he's had an service engine light since he got the car. Took it to autozone today and it's throwing P2270 which is basically pointing towards an O2 sensor. Question I have is from my reading there are 2 sensors one before and one after the coverter. Which one is bad. Any help you all can provide would be greatly appreciated. Look forward to spending allot of time here and spending my son's money on Mods
07-09-2008, 08:07 PM
#2
I ♥ Acer
Join Date: Jun 2008
Location:
Posts: 232
RE: Code P2270
Wow that is freaking weird, my car is throwing a P2195, and according to their definitions they are exactly the same. Maybe it's a different code for each side. Anyways, upstream sensors can measure lean. Did they tell you bank 1 or bank 2? Bank 1 is the passenger side, bank 2 is drivers side. Either way it's the front sensor.
07-09-2008, 08:18 PM
#3
4th Gear Member
Join Date: Jun 2007
Location: Cumberland County NJ
Posts: 1,369
RE: Code P2270
Its the downstream o2 sensor for bank one (passenger side). This sensor is after the cat. This code means it is stuck lean. It could be a bad sensor, pinched or shortedwires, or a corroded connector for starters.
07-09-2008, 08:22 PM
#4
I ♥ Acer
Join Date: Jun 2008
Location:
Posts: 232
RE: Code P2270
ORIGINAL: blackstallion666
Its the downstream o2 sensor for bank one (passenger side). This sensor is after the cat. This code means it is stuck lean. It could be a bad sensor, pinched or shortedwires, or a corroded connector for starters.
Its the downstream o2 sensor for bank one (passenger side). This sensor is after the cat. This code means it is stuck lean. It could be a bad sensor, pinched or shortedwires, or a corroded connector for starters.
07-09-2008, 08:25 PM
#5
Thread Starter
Join Date: Jul 2008
Posts: 12
RE: Code P2270
ORIGINAL: blackstallion666
Its the downstream o2 sensor for bank one (passenger side). This sensor is after the cat. This code means it is stuck lean. It could be a bad sensor, pinched or shortedwires, or a corroded connector for starters.
Its the downstream o2 sensor for bank one (passenger side). This sensor is after the cat. This code means it is stuck lean. It could be a bad sensor, pinched or shortedwires, or a corroded connector for starters.
Scott
07-09-2008, 08:31 PM
#7
4th Gear Member
Join Date: Jun 2007
Location: Cumberland County NJ
Posts: 1,369
RE: Code P2270
ORIGINAL: bb816331
I thought only upstream sensors could sense lean. I thought all the rear sensors did was make sure everything flowing out of the cat is ok?
ORIGINAL: blackstallion666
Its the downstream o2 sensor for bank one (passenger side). This sensor is after the cat. This code means it is stuck lean. It could be a bad sensor, pinched or shortedwires, or a corroded connector for starters.
Its the downstream o2 sensor for bank one (passenger side). This sensor is after the cat. This code means it is stuck lean. It could be a bad sensor, pinched or shortedwires, or a corroded connector for starters.
07-09-2008, 11:21 PM
#8
2nd Gear Member
Join Date: Mar 2008
Location: Richmond, VA
Posts: 416
RE: Code P2270
ORIGINAL: big mitch
Thanks for the info, I'll have to crawl under the car this weekend and give it a look. If I have to change a sensor any recommendations on brand. Autozone has Bosch. Thanks again.
Scott
Thanks for the info, I'll have to crawl under the car this weekend and give it a look. If I have to change a sensor any recommendations on brand. Autozone has Bosch. Thanks again.
Scott
i had one of the oxygen sensors on my car go bad about a month ago. when i crawled under there to check it out, guess what...it was a cheapy aftermarket one.
if you're gonna change it, do the job right so u won't have to worry about it again
07-10-2008, 07:21 AM
#9
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
RE: Code P2270
Here's the description of the catalyst monitoring from the shop manual:
The rear sensors switch just like the front, however they do it more slowly when the cats are good.
Codes P2270 through P2273 are thrown when they get "stuck" rich or lean despite the fact that in closed-loop mode the mix is always changing from rich to lean as the PCM keeps the average AFR stoichiometric.
This can be because of:
Pinched, shorted, and corroded wiring and pins
Crossed sensor wires
Exhaust leaks
Contaminated or damaged sensor
as indicated by bb816331.
Catalyst Efficiency Monitor
The Catalyst Efficiency Monitor uses an oxygen sensor before and after the catalyst to infer the hydrocarbon (HC) efficiency based on oxygen storage capacity of the catalyst. Under normal, close-loop fuel conditions, high efficiency catalysts have significant oxygen storage. This makes the switching frequency of the rear heated oxygen sensor (HO2S) very slow and reduces the amplitude of those switches as compared to the switching frequency and amplitude of the front HO2S. As the catalyst efficiency deteriorates due to thermal and/or chemical deterioration, its ability to store oxygen declines. The post-catalyst or downstream HO2S signal begins to switch more rapidly with increasing amplitude, approaching the switching frequency and amplitude of the pre-catalyst or upstream HO2S.
The Catalyst Efficiency Monitor uses an oxygen sensor before and after the catalyst to infer the hydrocarbon (HC) efficiency based on oxygen storage capacity of the catalyst. Under normal, close-loop fuel conditions, high efficiency catalysts have significant oxygen storage. This makes the switching frequency of the rear heated oxygen sensor (HO2S) very slow and reduces the amplitude of those switches as compared to the switching frequency and amplitude of the front HO2S. As the catalyst efficiency deteriorates due to thermal and/or chemical deterioration, its ability to store oxygen declines. The post-catalyst or downstream HO2S signal begins to switch more rapidly with increasing amplitude, approaching the switching frequency and amplitude of the pre-catalyst or upstream HO2S.
Codes P2270 through P2273 are thrown when they get "stuck" rich or lean despite the fact that in closed-loop mode the mix is always changing from rich to lean as the PCM keeps the average AFR stoichiometric.
This can be because of:
Pinched, shorted, and corroded wiring and pins
Crossed sensor wires
Exhaust leaks
Contaminated or damaged sensor
as indicated by bb816331.
07-11-2008, 04:47 AM
#10
2nd Gear Member
Join Date: Oct 2006
Location: Kannapolis, NC
Posts: 157
RE: Code P2270
pretty much what he just said, the rear o2 sensors dont do anything but check that the cat is working and how well it is. the front sensor is usually the only one that can cause a code to be set, at least thats how it was explained to me by my instructor