throwing a check engine light
Thread Starter
Le Mans Master
Joined: May 2005
Posts: 9,585
Likes: 1
From: Prepare yourself, for a pride obliterating bich smack. Fairfax, VA
St. Jude Donor '06-'07-'08
SEC > BCS 4 St. Judes '09
Originally Posted by FLUFFY-FOOFOO
Check this site out - I think it has the codes your looking for.
http://www.totallychevys.com/chevy/c...te-p-1694.html
Ordered Carchip - should be in Monday - will check it out on my Crown Vic with check engine light on - it's supposed to tell you code and reset the light. If it works I'm across from Whites Ferry in MD. Your welcome to try it. PM me.
http://www.totallychevys.com/chevy/c...te-p-1694.html
Ordered Carchip - should be in Monday - will check it out on my Crown Vic with check engine light on - it's supposed to tell you code and reset the light. If it works I'm across from Whites Ferry in MD. Your welcome to try it. PM me.
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 26
From: Austin Texas
shopdog; You are correct about not randomly resetting a CEL. In my case the CEL came after a CAI install 2 weeks after a LT header install and was expected, but I did use the On Star service before I reset the CEL. On Star won't give you the exact code but they did tell me " the code is emissions related, get the car to the Dealer within 2 weeks" so I knew it wasn't anything real serious.
Race Director
Joined: Oct 2004
Posts: 10,089
Likes: 14
Originally Posted by haljensen
shopdog; You are correct about not randomly resetting a CEL. In my case the CEL came after a CAI install 2 weeks after a LT header install and was expected, but I did use the On Star service before I reset the CEL. On Star won't give you the exact code but they did tell me " the code is emissions related, get the car to the Dealer within 2 weeks" so I knew it wasn't anything real serious.
Thread Starter
Le Mans Master
Joined: May 2005
Posts: 9,585
Likes: 1
From: Prepare yourself, for a pride obliterating bich smack. Fairfax, VA
St. Jude Donor '06-'07-'08
SEC > BCS 4 St. Judes '09
2 identical codes:
P0156
O2 Sensor
Circuit Malfunction
(Bank 2 Sensor 2)
i understand that 2 of my O2 sensors are freaking out, but is this an indication of a lean condition? i reset it. but not sure what this means.
P0156
O2 Sensor
Circuit Malfunction
(Bank 2 Sensor 2)
i understand that 2 of my O2 sensors are freaking out, but is this an indication of a lean condition? i reset it. but not sure what this means.
Thread Starter
Le Mans Master
Joined: May 2005
Posts: 9,585
Likes: 1
From: Prepare yourself, for a pride obliterating bich smack. Fairfax, VA
St. Jude Donor '06-'07-'08
SEC > BCS 4 St. Judes '09
ttt
does anyone know if the code i listed is benign or something to worry about?
does anyone know if the code i listed is benign or something to worry about?
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Same Issue, Different Code
I installed Kooks w/Cats and ran them with no CEL for about a month. Last week my CEL came on. I reset it a few times by disconnecting the battery but it would come back on in about 25 miles. Finally, I went to Autozone and had them run an OBDII scanner using the port under the steering wheel.
P0420 for Cat Low Efficiency on both rear O2s. I am going to have to get it tuned now.
P0420 for Cat Low Efficiency on both rear O2s. I am going to have to get it tuned now.
Race Director
Joined: Oct 2004
Posts: 10,089
Likes: 14
Originally Posted by Mayonayze
2 identical codes:
P0156
O2 Sensor
Circuit Malfunction
(Bank 2 Sensor 2)
i understand that 2 of my O2 sensors are freaking out, but is this an indication of a lean condition? i reset it. but not sure what this means.
P0156
O2 Sensor
Circuit Malfunction
(Bank 2 Sensor 2)
i understand that 2 of my O2 sensors are freaking out, but is this an indication of a lean condition? i reset it. but not sure what this means.
Race Director
Joined: Oct 2004
Posts: 10,089
Likes: 14
Originally Posted by ibogey99
I installed Kooks w/Cats and ran them with no CEL for about a month. Last week my CEL came on. I reset it a few times by disconnecting the battery but it would come back on in about 25 miles. Finally, I went to Autozone and had them run an OBDII scanner using the port under the steering wheel.
P0420 for Cat Low Efficiency on both rear O2s. I am going to have to get it tuned now.
P0420 for Cat Low Efficiency on both rear O2s. I am going to have to get it tuned now.
Ummm, if you switched to "high flow" cats when you did the headers, you may not be able to fix the problem. The so-called high flow cats are less efficient anyway, so adding more exhaust heat may not eliminate the codes. In that case, you will need a tuner to turn off the codes in the ECM. That doesn't actually fix the problem, it just prevents the code from turning on the CEL. It'll still be caught at an emissions inspection.
Thread Starter
Le Mans Master
Joined: May 2005
Posts: 9,585
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From: Prepare yourself, for a pride obliterating bich smack. Fairfax, VA
St. Jude Donor '06-'07-'08
SEC > BCS 4 St. Judes '09
Originally Posted by shopdog
It means the wiring to the sensor after the cat on the passenger side is either open or shorted. When you install headers, these wires have to be safely dressed away from the hot cats and pipes. If they aren't, they can burn through their insulation and cause this fault. It is also possible to get this code if the sensor itself was damaged when it was reinstalled. They are a bit delicate, and you have to be careful when installing them. But in that case you'd have gotten the code right away. So most likely you have a burnt wire.
Team Owner
Joined: Aug 2003
Posts: 38,314
Likes: 35
Originally Posted by shopdog
Or you could wait for warmer weather. You get cat low efficiency codes because the cats are now located further from the engine and don't get as much exhaust heat. This will throw codes in cold weather. A tune won't fix this. Using headers with a heat retaining coating, ie Jet Hot, is the better cure. It helps retain exhaust heat to the cat.
Ummm, if you switched to "high flow" cats when you did the headers, you may not be able to fix the problem. The so-called high flow cats are less efficient anyway, so adding more exhaust heat may not eliminate the codes. In that case, you will need a tuner to turn off the codes in the ECM. That doesn't actually fix the problem, it just prevents the code from turning on the CEL. It'll still be caught at an emissions inspection.
Ummm, if you switched to "high flow" cats when you did the headers, you may not be able to fix the problem. The so-called high flow cats are less efficient anyway, so adding more exhaust heat may not eliminate the codes. In that case, you will need a tuner to turn off the codes in the ECM. That doesn't actually fix the problem, it just prevents the code from turning on the CEL. It'll still be caught at an emissions inspection.
100%Been there and done that.
I would only add that he could try 02 sims if they are available for our cars.
That will stop it from setting codes and "may" allow it to pass inspection/emissions, if they don't do a visual, as no changes in the emissions programming in the car has been changed. But if they put it on the sniffer, it could be a different story.
Last edited by '06 Quicksilver Z06; Mar 5, 2006 at 07:08 PM.