You'll either have a O2 heater wire shorted (voltage or ground) or just a
bad O2 sensor. You can check the resistance of the wire from the O2
connector to the PCM - shouldn't be more than 5 ohms max. If it is, it's a
wiring issue...if it's not, O2 sensor.
- Bernd
----- Original Message -----
From: "Kurt Cypher" <cyphercats@earthlink.net>
To: <dakota-truck@dakota-truck.net>; <dodgedakotaowners@yahoogroups.com>
Sent: Monday, November 19, 2007 3:53 PM
Subject: DML: Trouble Code P0138
>
> I've had an intermittent "Check Engine Light" for a couple of weeks now,
> and I've finally been able to get a scanner connected to read it. It's
> showing P0138, about which the scanner's manual says "Oxygen Sensor
> Circuit /Heater High Voltage (Bank 1, Sensor 2)"
>
> After a brief search online, it looks like this is generally taken care
> of by checking the wiring from the sensor to the PCM, or by replacing the
> sensor itself.
>
> Any suggestions on anything else to check with this code? Also, if it
> comes down to replacing it, how difficult is it to replace this for
> someone who hasn't really spent much time crawling under vehicles over
> the years, but is starting to work on his vehicles himself more often, to
> try to save some money?
>
> Thanks,
> Kurt
>
>
>
This archive was generated by hypermail 2b29 : Tue Dec 04 2007 - 17:27:37 EST