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Old 04-24-2014, 01:54 PM   #1
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P0137 - '07 Aero

I've posted this on the other board but haven't been able to figure it out yet. Code is stating the second O2 sensor has low voltage. I've replaced the sensor with a Bosch #16175 from eeuroparts and installed a new battery. I've also checked the plug. I will start the car, reading is about .5 volts then tapers off to 0. If I unplug the sensor all together I get .5 volts steady. Plug it back in, bang 0 again. Getting frustrated.
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Old 04-25-2014, 11:17 AM   #2
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Some sensors use the exhaust as a ground and as such, need a ground strap.
If it's broken, you get super wonky readings.
I'd look for that. There's usually a ground strap or bracket on the downpipe between the sensors, or very close to them.
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Old 05-07-2014, 06:14 AM   #3
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There's a mounting bracket that connects the exhaust to the engine. I checked it, nice and tight. I also went through the O2 wiring diagnostics in the WIS. Wiring checks out. Could these type of readings indicate my cat is bad?
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Old 05-14-2014, 06:08 AM   #4
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This fixed it.

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Last edited by nocluetim; 05-14-2014 at 06:13 AM.
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Old 05-14-2014, 06:48 AM   #5
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so.. bad Cat?

heck of a reason to go 3"
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Old 05-14-2014, 07:40 AM   #6
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Yes, I believe it was a combination of a bad cat and a crappy bung extension someone welded on to repair stripped threads. It moved the sensor about 2 inches away from the flow.

"If you have the means, I highly recommend picking one up." -Ferris Bueller
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Old 05-14-2014, 09:26 AM   #7
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Here's the bung I mentioned.

photo 3.JPG
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Old 05-14-2014, 11:40 AM   #8
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Pffff.... yes. That's your problem.

Glad you found a nice 3" workaround!
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