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Old 05-25-2011, 07:45 AM   #1
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Best place to buy oxygen sensors

I just got a “check engine light” on my 2001 Boxster at 34000 miles. No engine performance decline, just the light coming on. Bought an Actron code checker and got “code P0134” for bad oxygen sensor.

Based on reading other threads on this site, I should probably replace all 4 sensors. What is the current thought on the best place to buy O2 sensors with the correct wires and plugs attached?

Randall Neighbor previously suggested www.oxygensensors.com as a good place to get them at reasonable cost (today = $77.52/each at http://www.oxygensensors.com/catalog.php?&pkey=1374836).

I’m wondering if these are good ones or if I should look somewhere else for Bosch units.
Any suggestions appreciated. Thanks.

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Old 05-25-2011, 08:00 AM   #2
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It might be a bad sensor, or harness, or heating circuit, or DME. Further diagnosis recommended. The simplest approach is to swap sensors and see if the error code moves to the other side. If it does, it's the sensor.

From Renntech:

P0134 Oxygen Sensor Ahead of TWC, Bank 1 – Interruption of Signal
Possible causes:
Open circuit in signal wire or ground wire
Oxygen sensor heating not functioning
Output stage in DME control module faulty
Internal resistance too high

Check:
– Wiring harness
– Oxygen sensor
– DME control module
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Old 05-25-2011, 08:44 AM   #3
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Try cleaning your MAF first. I've read that some have suggested replacing all 4 O2 sensors at the same time, but I don't see why. The sensors behind the cat should last much longer than the ones before it. at 34,000 miles, you shouldn't have to replace anything if the car wasn't abused.
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Old 05-25-2011, 08:46 AM   #4
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Advance auto parts has them for cheap and if you buy online you can use discount coupon codes to save even more $$$

Make sure you avoid the same mistake I made!

Buy ones that you DO NOT HAVE TO SPLICE!!!
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Old 05-25-2011, 09:02 AM   #5
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Quote:
Originally Posted by Topless
It might be a bad sensor, or harness, or heating circuit, or DME. Further diagnosis recommended. The simplest approach is to swap sensors and see if the error code moves to the other side. If it does, it's the sensor.

From Renntech:

P0134 Oxygen Sensor Ahead of TWC, Bank 1 – Interruption of Signal
Possible causes:
Open circuit in signal wire or ground wire
Oxygen sensor heating not functioning
Output stage in DME control module faulty
Internal resistance too high

Check:
– Wiring harness
– Oxygen sensor
– DME control module
I don't have the 22mm socket with the slot in it yet. But I ordered one from Harbor Freight today.
I'll try the sensor swap as soon as I receive it.
Thanks.
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Old 07-13-2011, 08:53 PM   #6
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Best Place To Buy O2 Sensors

I Found The Best Place To Buy O2 Sensors Is ************************************************************.
They Are By Far The Cheapest And They Say They Are Oem. Only $108.00 For Factory Oem With The Plug On The End.

http://www.************************************************************


Last edited by redsnapper; 07-13-2011 at 08:55 PM.
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