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Old 06-14-2010, 09:23 PM   #1
o'doyle
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Member#: 246566
Join Date: May 2010
Location: Grand Rapids, MI
Vehicle:
2004 2.5ts
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Default '04 2.5ts, new mods: CELs p0137 AND p0138

<duplicate thread: initially posted in Engine Management, but probably belongs here. I'll try to get a mod to kill the first thread before anyone responds.>

Evenin'. I have a problem. Well, technically I have two problems: a low AND high voltage on a brand new rear o2 sensor at the same time. How the crap?

The story:
My poor 04 ts recently destroyed (& clogged) its stock cat section, so I thought it would be a grand time to start upgrading.

I did what I could afford for now: the front half and a decent tune-up (hey, something had to blow up the old cat...).

Borla UEL headers
Stromung HFC
new gaskets everywhere (of course)
Rallitek wires
NGK BKR5EIX-11's (turns out you CAN spend over $8 a plug )
New o2 sensors: (cooked the old ones when the old cat started to clog)
AFR: Denso 234-9015
rear: Denso 234-4706

Rallitek rear o2 spacer

...and then I sent it all off to the shop. (I live in a crap apt. with no space for tools and no access to a lift )

Long story short, all of it bolted together perfectly, until the damned car turned out to have its "rear" o2 sensor 3 inches behind its "front" AFR, both in the front cat of the catalytic subsection. The Stromung HFC has the 1st cat deleted, and the rear o2 bung where it should be: in the rear cat. The wire on my replacement rear o2 was WAY too short to connect it to the harness, so I called up Caspers to order the harness extension...

...and they overnighted me one with the wrong *#&^!ing ends. $46 in shipping and it was wrong, wrong, wrong. This is probably my bad, but to be fair, it was labeled "Subaru O2 Extension Harness." Le sigh.

The shop picked up some decent wire, some ends, and some shrinky-dink tubing and spliced the rear o2 themselves, and I drove off a happy man...

...until it threw 2 codes a few minutes afterward: p0137 AND p0138. Together. How can my sensor throw a low and a high voltage at the same time?! Is it spliced incorrectly, is it a defective sensor, or did moving it back that far from its original location completely freak my ECU out?

Does an '04 EJ251 even use that sensor for its fuel trims, etc.?

Who the crap puts a downstream sensor 3 inches from the upstream sensor? That's retarded.

I'm open to suggestions at this point.

~OD
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Old 06-15-2010, 10:49 AM   #2
Gr3en
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Join Date: Oct 2007
Chapter/Region: MWSOC
Location: Gorillaoffroadcompany.com
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The reason is because you extended the wires. The sensor runs off of millivolts and it is not reading properly. I suggest you get a new rear sensor and the proper extension to make it work properly.
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Old 06-15-2010, 05:43 PM   #3
o'doyle
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Join Date: May 2010
Location: Grand Rapids, MI
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thx Gr3en. Not looking forward to telling the mechanic he's buying me a new rear sensor, lol.

Any other thoughts out there? Bueller?
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Old 06-19-2010, 06:48 PM   #4
o'doyle
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Join Date: May 2010
Location: Grand Rapids, MI
Vehicle:
2004 2.5ts
Silver

Default

they rewired their homemade extension, works great now.

I also handed them a coil of wire loom and some hangers and made them do it right

Now just scrounging for axleback money...
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