[DeTomaso] NPC Check Engine Light

[Art Stephens]

Thanks Ken. I ordered the one from Partstrain for $27. $39 by the time it was totaled up!

Art



From: Ken Green 
Sent: Friday, October 07, 2011 11:27 AM
To: Dave Londry ; Art Stephens ; det >> Pantera List 
Subject: Re: [DeTomaso] NPC Check Engine Light

I looked at the O2 sensor that came with the FAST XFI and I think it was a Denso sensor from a Honda.  They are a lot cheaper on the Internet than what FAST sells them for.

Ken

From: Dave Londry <davel at emspace.com>
To: Art Stephens <artstephens at verizon.net>; "det >> Pantera List" <DeTomaso at realbig.com>
Sent: Friday, October 7, 2011 10:56 AM
Subject: Re: [DeTomaso] NPC Check Engine Light

Of it happens to be the Bosch 4-wire.
They sell for 50 bucks now.
--------------------------------------
Here's some web poop.
The service manual describes an AF Ratio sensor on the exhaust side just 
ahead of the 'warm-up cat-converter, and an O^2 sensor downstream of the 
under-floor 3-way cat. The AF Ratio wide-band sensor feedbacks to the 
ECM to control the air-to-fuel mix at precisely 14.7:1; the reason for 
the downstream O^2 sensor is explained in the manual as a comparison 
data measurement 'to determine catalyst efficiency'; the O^2 sensor must 
be more than its namesake since O^2 sensors normally has two values: 
rich or lean versus an AF Ratio sensor which can actually detemine the 
fuel ratio, and apparantly some measure of efficiency is computed. In 
theory, if the AF Ratio sensor in tandem with the ECM and fuel-pulse 
delivery is fast enough and is working, the two catalytic converters and 
downstream O^2 sensor is just a back-up system doing nothing.
----------------------------------
http://www.partstrain.com/ShopByDepartment/Oxygen_Sensor/HONDA/CR-Z
These guys say they will sell you a tested replacement for $27.56.
--------------------------------------------------------------------------------------------
You may need a flare to get it off.

dave


On 07/10/2011 10:31 AM, Art Stephens wrote:
> Thank you Doug. At $287 for a new sensor, I might just try splicing in a $30 universal sensor?
>
> Art
>
>
>
> From: Doug Braun
> Sent: Friday, October 07, 2011 10:09 AM
> To: Art Stephens
> Cc: detomaso at realbig.com
> Subject: Re: [DeTomaso] NPC Check Engine Light
>
> Art,
>
> The mechanical shock from the rock can damage the sensor without any visible damage.  First thing I'd try is to buy a new sensor and install it.  The worst that will happen is you'll have a spare sensor.  Besides, sooner or later, that sensor is destined to wear out.  If the new senor doesn't fix it, suspect the wiring as it may have been damaged by the rock.
>
> PS: The "secondary" name for the sensor likely means it's one of two that is farther downstream in the exhaust and likely after the catalytic converter.  It purpose may only be to tell the ECU when the cat is lit.
>
> Doug Braun
> blue 73L #5505
>
>
> On Thu, Oct 6, 2011 at 4:55 PM, Art Stephens<artstephens at verizon.net>  wrote:
>
>    Hello guys,
>    I was driving my new Honda CR-Z  Hybrid thru Death Valley the other night when I came around a curve and found a rock in the middle of my lane. I wasn’t able to avoid it so I straddled it but it was too tall and banged up the bottom of my car. As soon as that happened I got a check engine light which turns out to be a Secondary HO2S Circuit Fault (sensor2), O2 sensor as near as I can figure. I can see no apparent damage to the sensor but the muffler has a big dent in it. Is the dented muffler the likely cause of the problem, increased heat due to the restriction, or does the circuit fault mean there is no signal from the sensor, or something else? I know if I take it to the dealer that they will want to replace the muffler and tail pipe for a thousand dollars and still no guarantee of solving the problem. Any thoughts?
>
>    Thanks,
>    Art
>
>
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