Common causes include dirty or contaminated maf sensor, faulty maf sensor, vacuum. I do find it a bit weird that the cat on these newer subarus clogged up so early (low 80k miles) compared to my older 2005 legacy wagon (sold it at 124k miles with original cat still on it without any cel code. A p0101 code usually won’t leave you stranded, but it does affect fuel economy, throttle response, and overall engine efficiency
Subaru Forester P0011: OBDII Code Diagnosis | Drivetrain Resource
If you have bungs either side of the cat, you could insert a pressure tester before and after the cat to confirm a blockage/restriction
If there are flanges either side, you could remove it,.
If your subaru forester has racked up over 100,000 miles and you see noticeable loss of performance with high fuel consumption, a defective. Getting to the bottom of code p0101 might mean chasing down a misbehaving map sensor or a hidden catalytic converter blockage Both are less common than a dirty maf—but hey, modern engine. Repair information for p0101 subaru code
Learn what mass or volume air flow circuit range/performance problem means, location and how to repair. It came out to be the catalytic converter, rich gas or possibly an o2 sensor So after a while, i took it to a subaru / honda / volvo dealership and had them see what they came up with Replace or repair frayed, broken, or burnt wiring harness and connector.
Mass or volume air flow circuit range/performance description:
Yes, you can go with one cat The custom exhaust on my son's '03 x only has one cat The rear o2 sensor monitors the efficiency of the cat. This sensor is where the infamous p0420.
This means that the engine control module (ecm) has detected that the signal from the. This low kilometer subaru impreza flags a p0420 catalyst efficiency fault code very quickly The rear o2 sensor would behave almost like the catalytic converter had been removed. Learn about this problem, why it occurs, and how to fix it.
