Join Date: Sep 2012
Location: Canada, Quebec
Car Year: 2000
Car Model: Forester Ltd S
So I get a little better performance after the TB cleanup, new air filter etc. seems to be smoother in general and a little more torque..
What still puzzles me; The 0420 code for cat efficiency... I know this problem is a situation with many possibilities but I just want to start with what doesn't make sense to me.
On my OBD2 scanner (TORQUE app) My O2 (1x2) B1S2 shows voltage fluctuation I set up a graph and it goes from 0.2 when idle for a long time, and stays in the 0.5-0.9 range when driving. Yet the 1x1 (B1S1) seems dead on the readings stays at a stagnant 0V, and never moves. How can the car run if the B1S1 is dead(If thats the case) and how can the ECU throw a 0420 code when : 1) The sensor works fine in appearance, and 2) It has no B1S1 values to compare to. (Would this entitle to a direct CAT failure if the sensor is working fine(I think) and we get an efficiency code?)
Now I know many "backyard" jobs have been done to this rig, such as home made bushings on certain struts, clutch change but no flywheel reface (I figure as it shakes like hell when you pull off from a stop without giving it gas) there is also quite an apparent WELD around the joint between the first cat and where the two pipes come from the heads (Figured the flange must of been screwed)
Do you guys think its possible to plug the B1S1 sensor in the B1S2 ?
Where would you guys start probing for something feasible. Can I use my multimeter to physically read the sensor's voltage see if its working?