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How To Address a Subaru P0420 (Step by Step) NSUGS. 162 subscribers. Subscribed. 260. 16K views 1 year ago. The nerdy and keen eyed will notice I omitted …WAKE FOREST, N.C., Dec. 16, 2020 (GLOBE NEWSWIRE) -- Wake Forest Bancshares, Inc., (OTC BB: WAKE) parent company of Wake Forest Federal Savings ... WAKE FOREST, N.C., Dec. 16, 20...quick question im in the process of having my cat converter swapped because of the check engine light with a P0420 reading. This might be a nube question but i need to figure it out asap or i wont pass inspection. ... I am in need of help with a 1999 Subaru Forester upstream o2 sensor. The shop that rebuilt the engine replaced the stock with ...ayarnell7. 1 post · Joined 2022. #8 · Jan 11, 2022. 2008 Impreza 2.5 - had C0071, C0075 and C0042. My nephew's car. I noticed right away some corrosion on the positive battery terminal. Cleaned and treated with corrosion preventative spray, then looked at all the engine ground connections, all looked good.Oct 5, 2021 · Bought my 2014 Forester 2.5L in July; 3 weeks later, engine light came on, P0420; Finally got it looked at last week, they found a vacuum leak, fixed it, and said it was good to go; Two days later, engine light came back on, took it back to the shop, and they said it was the front cat and it needed to be replacedWhen it comes to choosing the perfect SUV, Subaru has long been a trusted brand. With their commitment to safety, reliability, and versatility, it’s no wonder that the Subaru Outba...2007 - O2 converter (P0420) / head gasket leak? Hi my high mileage (443K km) Forester has been throwing a check engine code for a while now. Got it read and it was P0420 - Catalyst System Efficiency below Threshold, Bank 1. My mechanic just called and 1) noted the head gasket leak is much worse than previous); 2) cylinder 3 is misfiring; and 3 ...2005 subaru forester w/ 320k. A few months back, my sputtering/shuttering problem threw the codes P0031, P0134. I replaced the upstream o2 sensor and it appeared to fix the issue. ... Reading through this thread ive noticed the code P0420 mentioned often without the changing the cat. If the Cat is clogged, its restricting air flow which ...Silver. I'm seeing the P0420 code as well (all stock 2005 Subaru WRX STI). Here's my story... After nearly a dozen resets using a scanner tool, I observed that the CEL would only trigger after the car had warmed up and I was cruising at ~55 MPH. So I decided to investigate.My son's outback with 200+ miles had been having the P0420 code pop up on occasion. It would only happen after driving a long distance and only on the way home. I've already replaced both front and rear sensors. ... We're the best Subaru Forester Owners Forum to talk about the best years of the Subaru Forester, modifications and reliability ...Engine/Traction Control on, Cruise blinking code P0420. I'm having an intermittent engine light on my '11 Limited. For the past several fill-ups, though not every time, the CEL and Traction Control will come on and the Cruise Control blinks. This has always happened when I'm driving at a constant speed with Cruise on.=====Claim your FREE engine code eraser 👉 https://free.nonda.co 👈== How to Fix P0420 =====Engine Code P0420 Saving Repair Part...Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first. ⚠ Check if your Subaru have Safety Recalls.Subaru of America, Inc. (SOA) has determined that vehicles affected by this Service Program require ECM reprogramming. ... performed with over 100,000 miles and the Check Engine light illuminated with DTC P0420 in the ECM memory. The catalytic converter efficiency test must also indicate replacement is necessary. For all other vehicles, the ...P0172. Fuel trim rich, long term fuel trim -23%. Started vehicle STFT was -53%. AF Sensor resistance is 79 ohms, mass air flow is 10 G/S at 600 RPMS. Exhaust is blowing black smoke. Mass air flow sensor should be 2.5 to 2.8 G/S, AF Sensor resistance should be 50 ohms. Mass air flow and AF sensor need replacement. P0420.

Next day, CELs out the wazoo. All O2 sensor and cat-related (P0420, P015A, P015B). It was the weekend, so I didn't go straight to the dealership, and then they went away after 5 cycles or so. Well, they're back, and it's now been 8 cycles with the codes still showing and the engine "stuttering" even worse than before.Hi guys. New to the forums. Just bought a 2005 Forester XS N/A and I too have the dreaded P0420. Previous owner had the catalytic converter replaced before I bough the car so I didn't think it would be a bad cat. Got under the car this weekend and found an exhaust leak where the catalytic converter bolts to the y pipe.03 Forester X 154,000 Miles. Bought in October 2020 About a month ago I got a CEL it turned out to be the P0420 code. No loss of performance. Since then I changed spark plugs and did the $ 5 fix, but still get the code when I drive on the highway. I assume both O2 are the original ones. No exhaust leaks that I can detect.Normally, P0420 could just be the catalytic converter, or the rear O2 sensor. At this mileage, it wouldn't be that of a surprise. The code is fairly well known in the Subaru community, if you search in the Forester or NASIOC forums. It's normal for it to trigger a Christmas tree of warning lights, including emission, and (go figure) disabling ...Jun 4, 2017 · My '11 (140k miles) has been throwing a P0420 code along with running a bit rough, it stalls from a start (oddly the autostart has no issues keeping it running), and I'd say I'm down to about 70% power overall. The dash is lit up like a Christmas tree with the cruise flashing and two vehicle dynamics lights on.

The CEL went out and all seemed good. Now 300 miles later I have 2 codes, P0420 and P0031. Both are listed as confirmed and a P0420 is also listed as permanent. I reset the system to clear them. I thought after I made the repair that the permanent code would clear itself but hasn't. The car runs perfectly however.Like I said in the thread title, the P0420 CEL has been on since last September or so. It never really affected the performance of the car other than a slightly lower gas mileage so I was never really bothered. ... We're the best Subaru Forester Owners Forum to talk about the best years of the Subaru Forester, modifications and reliability ...DieKeis. 205 posts · Joined 2009. #17 · Jun 28, 2010. I get the P0420 code at irregular intervals. Sometimes on a 6-8 hour road trip I'll get it 2 or 3 times (I reset it with my Scangauge II), other roadtrips I get nothing. And then occasionally it'll pop up on my 7 mile commute - again I reset it.…

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. Vacuum leaks are a known problem in late model Subarus. Start your d. Possible cause: Technical Forums and Vehicle Assistance. Engine and Exhaust. EJ25 - 2.5L Non-Turbo .