Help CEL p1148
#1
CEL p1148
Unfortunately, I am stuck with a Performance's Shop mistake.
Read More here : https://www.myg37.com/forums/northea...ml#post3163382
They replaced my Stock cats with aftermarket performance ones and managed to break what I believe is the Air fuel ratio sensor 1.
From the service manual:
P1148, P1168 CLOSED LOOP CONTROL
P1148
Trouble diagnosis name
Closed loop control function (bank 1)
DTC detecting condition
The closed loop control function for bank 1 does not operate even when vehicle is driving in the specified condition.
Possible cause
Harness or connectors (The A/F sensor 1 circuit is open or shorted.)
• A/F sensor 1
• A/F sensor 1 heater
Can someone chime in and tell me what this means? From the looks of it my Air fuel ratio sensor (bank 1) needs to replaced? Is this the Air fuel ratio sensor that is located on the passengers side header?
How easy is it to replace this sensor? Can I DIY?
Thanks
Read More here : https://www.myg37.com/forums/northea...ml#post3163382
They replaced my Stock cats with aftermarket performance ones and managed to break what I believe is the Air fuel ratio sensor 1.
From the service manual:
P1148, P1168 CLOSED LOOP CONTROL
P1148
Trouble diagnosis name
Closed loop control function (bank 1)
DTC detecting condition
The closed loop control function for bank 1 does not operate even when vehicle is driving in the specified condition.
Possible cause
Harness or connectors (The A/F sensor 1 circuit is open or shorted.)
• A/F sensor 1
• A/F sensor 1 heater
Can someone chime in and tell me what this means? From the looks of it my Air fuel ratio sensor (bank 1) needs to replaced? Is this the Air fuel ratio sensor that is located on the passengers side header?
How easy is it to replace this sensor? Can I DIY?
Thanks
Last edited by OMG35S; 06-21-2011 at 12:05 PM.
#2
Registered User
iTrader: (1)
I'm not entirely familiar with the bank part of your post. I was under the impression that our cars only came with 2 total O2 sensors. Is there a before O2 sensor as well? If you're talking about the one that I think you're talking about, then the entire process is no sweat. If I do remember correctly though, O2 sensors for our cars in particular aren't cheap. The O2 sensor's are plugged right into your cats. If it's toast for sure, then pull it out and toss it. If you think it's still good, just pull it out (w/ O2 socket) and place it into a plastic bag. Make sure you're NOT touching the sensor with your hands, etc. Be very careful. They're not extremely sensitive, but some (stupid) people say that mishandling it can damage it, easily. When and if you purchase a new O2 sensor, take it out and place it also into a plastic baggy in between installing; do not touch the sensor.
Jack up car, throw in jack stands, slide under, turn left to loosen, unplug the sensor (it's clipped to the transmission) and reverse to install. No biggie. GL!
Jack up car, throw in jack stands, slide under, turn left to loosen, unplug the sensor (it's clipped to the transmission) and reverse to install. No biggie. GL!
#3
Registered User
iTrader: (1)
Wait a minute...the header? Do we have O2 sensors prior? If they didn't touch your headers, in which they absolutely should not have (engine bay or directly off the manifold), then your initial O2 sensors should be fine. Adding high flow cats or even test pipes will not (100% sure) influence the performance of your O2 sensors pre-hfcs or tps. Like I said, it has to be one of the O2 sensors off the hfcs or tps that you had installed. If that's not the case, your car could just be throwing a code. There could possibly be a crack, or a leak. Both will throw codes - too much air flow (even the extra bit from a crack or leak) will cause your O2 sensor to read high, and therefore throw a code. Check for leaks (they HAVE TO USE silicon gasket maker in between the connection points of the headers and your new hfcs/tps; if they didn't, then that's your problem - you have a leak), and/or connection issues. Look for exhaust marks (stains) under your car - tells you leak points. You might also be able to hear it (aside from the slight rasp associated with hfcs/tps). Let us know!
#4
Thanks for your feedback eksigned.
I believe my reader is showing the sensors that are connected to the headers. They are called Air fuel sensors. They are before the O2 sensors from the cat. I've read that they are known to get damaged if you are installing new rtp's/hfc's. The mechanic did use a new gasket and applied some sort of lubrication on the flanges.
The car does sound different and I don't know exactly how its suppose to sound like because I'm the first one with my set-up and I've never ran RTP's before.
I'll check for leaks but I'm pretty sure the air fuel sensor is shot... Hopefully someone can chime in if they had a similar experience...
I believe my reader is showing the sensors that are connected to the headers. They are called Air fuel sensors. They are before the O2 sensors from the cat. I've read that they are known to get damaged if you are installing new rtp's/hfc's. The mechanic did use a new gasket and applied some sort of lubrication on the flanges.
The car does sound different and I don't know exactly how its suppose to sound like because I'm the first one with my set-up and I've never ran RTP's before.
I'll check for leaks but I'm pretty sure the air fuel sensor is shot... Hopefully someone can chime in if they had a similar experience...
#7
The sensor is easily seen through the engine bay without removing anything. Look at the headers on the passenger side and you'll see the sensor down below.
My RTP's come with an extended O2 Bung which should eliminate all CELs.
I'm trying to work it out. We'll see what happens.
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