Cracked exhaust and o2 sensor replacement
05-29-07, 10:40 AM
#1
Lead Lap
Thread Starter
Cracked exhaust and o2 sensor replacement
Had the (left) front manifold replaced on friday at Lexus as it suddenly developed a 3" long crack around the o2 sensor.
The check engine light also came on and car began to buck and kick like a bronco on the highway.
Dealer read code to be CODE P0171 system too lean, Pending Code P0136 o2 sensor bank 1 sensor 2.
$426 CAD later, the car runs great and no more check engine light. They replaced the last o2 sensor (after cats).
My question is, what are the chances that the other 2 O2 sensors are going sometime soon?
BTW, car would intermittantly knock before this, now, beautiful, no more knocking...
Could the lean mixture prior to triggering the CE light have caused knock? I suspect yes, which means hopefully my knocking and pinging is a thing of the past.
The check engine light also came on and car began to buck and kick like a bronco on the highway.
Dealer read code to be CODE P0171 system too lean, Pending Code P0136 o2 sensor bank 1 sensor 2.
$426 CAD later, the car runs great and no more check engine light. They replaced the last o2 sensor (after cats).
My question is, what are the chances that the other 2 O2 sensors are going sometime soon?
BTW, car would intermittantly knock before this, now, beautiful, no more knocking...
Could the lean mixture prior to triggering the CE light have caused knock? I suspect yes, which means hopefully my knocking and pinging is a thing of the past.
05-29-07, 10:49 AM
#2
Super Moderator
Any time you have a mixture out of whack, things can go ping. There is a vehicle that comes to my track once a month that has nasty pinging and I will see if I can get a video of it should it show up.
With the O2 sensor after the cat, that figures more into emissions (using a wavelength). There is actually a P0420 error with low catalyst threshhold (can't remember the precise name) that has popped up on some vehicles my exhaust shop works on, so I am happy to see just P0136.
With the pinging, usually the 2 a/f sensors would come into play there.
As far as those sensors going, the answer is it depends. I have seen people toss in racing gas (with lead) into vehicles repeatedly not have any issues, whereas other vehicles are run like puppies and they get a sensor issue.
With the O2 sensor after the cat, that figures more into emissions (using a wavelength). There is actually a P0420 error with low catalyst threshhold (can't remember the precise name) that has popped up on some vehicles my exhaust shop works on, so I am happy to see just P0136.
With the pinging, usually the 2 a/f sensors would come into play there.
As far as those sensors going, the answer is it depends. I have seen people toss in racing gas (with lead) into vehicles repeatedly not have any issues, whereas other vehicles are run like puppies and they get a sensor issue.
05-29-07, 10:57 AM
#3
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I had this car and replaced every sensor imaginable. The sensors are:
1. Bank one sensor 1 in the front exhaust manifold.
2. Bank two sensor 1 in the rear exhaust manifold.
3. Bank one sensor 2 is the one under the drivers door after the cats.
4. Mas air sensor in air box.
The sensors go bad on these cars regularly. My front sensor (1 listed above) got melted in the exhaust, had to replace the manifold because of this. Then the rear sensor (#2 above) went bad, followed by the cats going bad and messing up #3 above and finally the air flow sensor went bad. All of this happened in miles 50-95k.
1. Bank one sensor 1 in the front exhaust manifold.
2. Bank two sensor 1 in the rear exhaust manifold.
3. Bank one sensor 2 is the one under the drivers door after the cats.
4. Mas air sensor in air box.
The sensors go bad on these cars regularly. My front sensor (1 listed above) got melted in the exhaust, had to replace the manifold because of this. Then the rear sensor (#2 above) went bad, followed by the cats going bad and messing up #3 above and finally the air flow sensor went bad. All of this happened in miles 50-95k.
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