PLEASE help with code P1274 after header install
04-25-2009, 02:57 PM
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PLEASE help with code P1274 after header install
I got headers on at dealership, got it back friday, I rode out that night all was fine, next day that afternoon after turning on the ac i noticed the engine service soon light. Went to auto and got P1274 which read 001-failed af sensor and 002-fuel injector or pressure fault. BBaf sensor rich shift detected for definition. I have an injen intake and fast intentions exhaust, all where installed before this issue, which arrived day after header change.
04-25-2009, 02:58 PM
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We took off negative on battery. i pumped the brake till it got firm and we let it sit for 10 mins if that and the code is gone, has come back yet. Im going to take it back to stealership and see if something needs to be rebolted.
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04-30-2009, 10:48 AM
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I have the crawfords headers and fast intentions exhaust, I going to have to add spacers to cross member near headers to stop a vibration or rattle.
05-01-2009, 03:18 PM
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Something like that ........ thanks for helping with issue at hand nismo ! Go get some goodies, I got a headache from this situation, hell ill join ya !
05-14-2009, 11:18 AM
#14
idk ive never heard of throwing codes from installing headers, are u sure the o2's are good up top there or are in and not damaged at all...i dont thiink i would just get a utec to try and solve the problem, theres def. a reason its happening...are they e-bay headers or something
05-26-2009, 04:15 PM
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no i got these from someone here on marketplace, they arent cracked or damaged. I asked the dealership to check 02's and they said that they are fine.
05-26-2009, 04:34 PM
#16
Hey murders,
Sounds like to have a AFR issue. What year Z? At this point I am thinking exhaust leak. Have you tried swapping the sensors on the headers around?
Chad
Notes:
DTC: P1274
Trouble diagnosis name: Air fuel ratio (A/F) sensor 1 (Bank 1) rich shift monitoring
Component Description
The A/F sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement λ= 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide λ range (0.7 < λ < air).
The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygen-pump cell so that the composition of the exhaust gas in the diffusion gap remains constant at λ = 1. Therefore, the A/F sensor is able to indicate air/fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800°C (1,292 - 1,472°F).
DTC detecting condition:
* The output voltage computed by ECM from the A/F sensor 1 (Bank 1) signal is shifted to the rich side for a specified period.
Possible cause:
* Air fuel ratio (A/F) sensor 1
* Air fuel ratio (A/F) sensor 1 heater
* Fuel pressure
* Fuel injector
Sounds like to have a AFR issue. What year Z? At this point I am thinking exhaust leak. Have you tried swapping the sensors on the headers around?
Chad
Notes:
DTC: P1274
Trouble diagnosis name: Air fuel ratio (A/F) sensor 1 (Bank 1) rich shift monitoring
Component Description
The A/F sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement λ= 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide λ range (0.7 < λ < air).
The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygen-pump cell so that the composition of the exhaust gas in the diffusion gap remains constant at λ = 1. Therefore, the A/F sensor is able to indicate air/fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 - 800°C (1,292 - 1,472°F).
DTC detecting condition:
* The output voltage computed by ECM from the A/F sensor 1 (Bank 1) signal is shifted to the rich side for a specified period.
Possible cause:
* Air fuel ratio (A/F) sensor 1
* Air fuel ratio (A/F) sensor 1 heater
* Fuel pressure
* Fuel injector
05-30-2009, 05:37 PM
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I not sure to what extent they have check 02's, I havent gotten it tuned for all mods yet, wondering if that would solve issue. The gaskets are new and there was a search for leaks and if bolts on headers are tight. I have the fast intentions exhaust and crawford headers mated together in a 05 roadster, those guys at the dealership had a hard time with install, im in pensacola fl there wasnt anyone else here locally that i felt comfortable with. The exhaust was done before headers and everything was fine. Now this thing is haunting my nightmares. I used stock gaskets with the headers, do they come with their own gaskets new. May need to get a second opinion somewhere just not many sources that i trust here.
05-30-2009, 05:42 PM
#19
theres alot of things to check on the o2 also the wires, not just look at it and say its ok, there are heaters in them and etc. that if not working right will throw codes, and yes u should have used different gaskets with the headers and u may have a leak, i would absolutely take the car somewhere else and quit thinking that a tune is gonna solve ur problems, u should not have any codes popping up from a header install!! i would worry about finding whats wrong before going in for a tune, take it somewhere even if u have to drive, im sure thare are many many performance shops in fl, and prolly a handful for the vq
