08-10-2024, 03:19 AM
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#1
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Registered User
Join Date: Aug 2024
Posts: 5
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O2 weird situation
Hello, can someone please help me with a weird situation regarding an o2 sensor that is acting very strange
So, the story is this, about an year ago I bought a 986 from 99. Love the car but i had stored in the ecu an error: o2 ahead of cat bank 1 no signal. No check engine on the dash.
I proceeded to change the sensor with a brand new Bosch part. After installing the part i now get the error: 02 Sensor Ahead Of Cat. Conv., Cylinder (1-3) below limit value
No leaks on the exhaust, the check engine is off but i don t get it why the ecu shows this error, specially the o2 is new.
Could this be related to the fact that i have a Dansk Motorsport exhaust?
Thank you
Last edited by Alexchris11; 08-10-2024 at 06:16 AM.
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08-10-2024, 06:12 AM
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#2
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,613
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More likely a wiring harness issue.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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08-10-2024, 06:16 AM
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#3
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Registered User
Join Date: Aug 2024
Posts: 5
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Sorry, just edited the first post. The error i got now is 02 Sensor Ahead Of Cat. Conv., Cylinder (1-3) below limit value
To give more details about this situation, when I finished mounting the new sensor, I started the car and I check with my scanner the values of the new o2. The values were great, 0.2 -0,7.
Then after 10 minutes of driving, I checked again and the values are with minus (-0.1 - -0.3).
Last edited by Alexchris11; 08-10-2024 at 06:31 AM.
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08-10-2024, 07:58 AM
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#4
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,613
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What code numbers are you seeing?
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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08-10-2024, 08:57 AM
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#5
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Registered User
Join Date: Aug 2024
Posts: 5
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02 Sensor Ahead Of Cat. Conv., Cylinder (1-3) below limit value, I do not have a code, my scanner shows only this error.
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08-10-2024, 09:42 AM
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#6
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,613
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Without the actual codes, I cannot help you any further..................
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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08-10-2024, 12:12 PM
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#7
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Registered User
Join Date: Aug 2024
Posts: 5
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I think is p0133
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08-10-2024, 01:43 PM
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#8
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,613
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P0133 is the aging out of the sensor ahead of the three way cat on bank #1.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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08-10-2024, 05:39 PM
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#9
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Registered User
Join Date: Aug 2024
Posts: 5
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Again sorry, today i diagnosed the car with a different scanner. The error code is:
P1115 - Oxygen Sensor heating side 1 ahead of Cat - below lower threshold
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08-11-2024, 03:54 AM
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#10
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Registered Member
Join Date: Oct 2022
Location: NJ
Posts: 180
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Back to JFP’s original comment - sounds like wiring problems.
__________________
Tom Coradeschi
03 Boxster
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08-11-2024, 06:53 AM
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#11
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,613
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P1115:
Heating current too low
-Interruption in heater circuit
-Interruption in sensor wires
-Short circuit
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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