2006 Impreza 2.5i A/F sensor code P0031, sensor heater resistance?
#1
Scooby Newbie
Thread Starter
2006 Impreza 2.5i A/F sensor code P0031, sensor heater resistance?
My car threw CEL code P0031. Before going out and buying a new A/F oxygen sensor, I figured I’d do some basic checks. I don’t have the complete factory service manual (I just have the basic maintenance and dealer setup manual) and was hoping someone here could help me out and perhaps the answers will help others. I disconnected the sensor’s connector on the top front of the engine. With the ignition key on but the engine not running, I saw ~12.0 VDC across the engine side of the harness heater wires. I then checked the resistance across the two black heater wires on the sensor side and saw 2.3 ohms. What is the correct resistance for the heater circuit on the A/F sensor? I searched this and other forums and I can’t find a definitive answer. For what it’s worth, the sensor was cold (engine hadn’t been run for about 8 hours). Wires look intact and all strain reliefs are OK. The car is a completely stock 2006 US model Impreza 2.5i and the sensor is the original factory unit. Thanks in advance.
- Walt
- Walt
The following users liked this post:
#2
Scooby Regular
This is all that's available from the workshop manual without having a new sensor to hand
US MY06 2.5L non turbo P0031 diagnostics.pdf
US MY06 2.5L non turbo P0031 diagnostics.pdf
Thread
Thread Starter
Forum
Replies
Last Post
T32ER
General Technical
10
27 March 2014 10:07 PM