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| # | Post Title | Result Info | Date | User | Forum |
| Answer to: P0420 Hello sir I really enjoy your show I have a 2011 Chevrolet Traverse LTZ I have 286000 thousands miles on it only thing I have done is change the oil and tires and breaks now I have a code p0420 can you help me out with this please si... | 21Relevance | 6 years ago | Klob | Submit Your Question HERE | |
| Hello look like a cat issue. | |||||
| Answer to: Don't Ignore P0420 codes | 21Relevance | 2 years ago | Hixster | Submit Your Question HERE | |
| When did Scotty say to "you can ignore a PO420 code"? A flashing CEL means attention required immediately , a non-flashing CEL means attention required soon. A PO420 code typically causes a non-flashing CEL. Regardless, a PO420 is a common code but it does not mean "you definitely have a bad catalytic converter". Many things can cause this code: and none of the causes for it should be ignored. | |||||
| 2004 Toyota Camry SE P0420 | 21Relevance | 2 years ago | Jte87 | Submit Your Question HERE | |
| I have a 2004 Toyota Camry SE with a 3.3l V6. It's showing a p0420. I've also noticed a rattling noise. With a p0420, which would be the catalytic converter that'll need replacing? Would it be the one nearest the radiator or the firewall? | |||||
| Answer to: P0420, P0456 | 21Relevance | 3 years ago | Chuck Tobias | Submit Your Question HERE | |
| Have you done any troubleshooting to determine the actual cause of the codes? | |||||
| 2007 Corolla dies while driving (VERY DANGEROUS) | 27Relevance | 5 years ago | MannyPaul | Submit Your Question HERE | |
| ... to get it running and changed the shift solenoid. (I tested all three and changed the bad one) - I thought I fixed the issue but then I got a check engine light within the same day. Got a P0341 with a p0420. - I changed the camshaft position sensor and I ran the codes and only had a p0420 code. - Yesterday I was getting onto the ramp and accelerating heavily and the car died on me on the highway. I had to get it towed off the highway. Once off the highway, scanned the codes and it was only a P0340 code (not P0341). I disconnected and reconnected the cams ... | |||||
| Don't Ignore P0420 codes | 21Relevance | 2 years ago | MinivanMom1990 | Submit Your Question HERE | |
| Hey Scotty, I just wanted to tell you to stop telling people they can ignore a p0420 code. You do have to fix them. I ignored my p0420 code for 4 years because I thought my 2006 Sienna was just picky about the aftermarket cats I had put on it in 2021. Wrong. It started rattling in Dec 2023 but we didn't know where the rattle was coming from. In June 2024, we tried to take it on a road trip from Virginia to Memphis TN, we stopped at the rest stop just before Bristol, got back on the interstate, only made it one exit down and the car just stopped running. Engi ... | |||||
| P0420 Code on 1998 Celica GT | 21Relevance | 2 years ago | ConnieCelica | Submit Your Question HERE | |
| ... A few years ago, I encountered a p0420 code and successfully used your lacquer thinner method to resolve the issue. Recently, however, I’ve experienced overheating, which triggered a new p0420 code. I want to mention that the radiator, hoses, thermostat, and coolant were all replaced with new OEM parts in January. Despite these updates, the engine is now running rough, and I want to make the necessary repairs. I’ve noticed that my Celica has a slightly different setup compared to the 1994 model, featuring a Toyota Three-Way Catalytic Converter (TWC). It h ... | |||||
| Answer to: Catalytic Converter P0420 | 21Relevance | 3 years ago | Chuck Tobias | Submit Your Question HERE | |
| We can't tell that from here. Exhaust leak is one of the possible causes for p0420, among others. Wasn't that checked for prior to replacing the catalytic converter? | |||||
| Answer to: 2007 Camry p0420 code | 21Relevance | 3 years ago | Chuck Tobias | Submit Your Question HERE | |
| There are quite a few things that can cause the p0420 code: Have you checked operation of the O2 sensors? | |||||
| Answer to: Would Oil in the tube, leaking valve cover cause a P0420? | 21Relevance | 3 years ago | Chaseboy4 | Submit Your Question HERE | |
| Carbon build up can also trigger code p0420. Had that happen to my 2014 Jeep Grand Cherokee Lared threw that code up but there were no symptoms of a failing O2 sensor or cat but it did have some power loss. Bought Seafoam Intake Cleaner and after it cleared all the carbon out the check engine light and code p0420 was killed | |||||
| 2006 4Runner P0420 | 21Relevance | 4 years ago | Tmorri51 | Submit Your Question HERE | |
| 2006 4runner p0420 202k miles Check engine light came on a couple weeks ago, it’s always p0420 even after I replaced both o2 sensors on that side. Should I replace the cat asap to avoid damaging the engine? | |||||
| RE: Elusive Ecoboost P0420 | 21Relevance | 4 years ago | MountainManJoe | Submit Your Question HERE | |
| also try searching the forum. p0420 is covered in some depth in the FAQ. Also , the same question was posted a day or two ago: | |||||
| Answer to: How do I fix diagnostic trouble code P0420 - Catalyst System Efficiency Below Threshold | 21Relevance | 4 years ago | MountainManJoe | Submit Your Question HERE | |
| Have you searched Scotty's youtube channel? | |||||
| 2010 Honda accord - several codes | 27Relevance | 6 years ago | wtatum | Submit Your Question HERE | |
| Hello, I've watched your show now for about 2 yrs. I have 2010 honda accord 4 cylinder auto 189,000. It throwing several codes (see below). But it drives just fine. I have always changed engine oil every 10K with Synthetic. Engine uses 1/2 quart every 5K mile. I recently changed transmission fluid by doing the drain and fill 3 times with gen. honda auto fluid. I cleared the codes but now there back with more codes! I have owned it for 1/2 its life and have driven it normal. Could I have some sort of Elect. or ECM problem or is tranny and engine on its last leg? Note I did replace the Cat about 2 yrs ago. Long term fuel trim is -4. Thank for the HelpWes T. from Delhi, La Car Scanner ELM OBD2DTC reportSelected brand: HondaVIN: 1HGCP2F43AA181798 ============1==============P0722(02)Raw code: 072202ECU: 1DStatus: Test not completed during this operation cycleOBDII: Output shaft speed (OSS) sensor - no signalHonda: Problem in Countershaft Speed Sensor Circuit (No Signal Input) ============2==============P0977(02)Raw code: 097702ECU: 1DStatus: Test not completed during this operation cycleOBDII: Shift solenoid (SS) B - circuit highHonda: Open in Shift Solenoid Valve B Circuit ============3==============P0976(02)Raw code: 097602ECU: 1DStatus: Test not completed during this operation cycleOBDII: Shift solenoid (SS) B - circuit lowHonda: Short in Shift Solenoid Valve B Circuit ============4==============P0974(02)Raw code: 097402ECU: 1DStatus: Test not completed during this operation cycleOBDII: Shift solenoid (SS) A - circuit highHonda: Open in Shift Solenoid Valve A Circuit ============5==============P0973(02)Raw code: 097302ECU: 1DStatus: Test not completed during this operation cycleOBDII: Shift solenoid (SS) A - circuit lowHonda: Short in Shift Solenoid Valve A Circuit ============6==============P0706(02)Raw code: 070602ECU: 1DStatus: Test not completed during this operation cycleOBDII: Transmission range (TR) sensor - range/performance problemHonda: Open in Transmission Range Switch Circuit ============7==============P0705(02)Raw code: 070502ECU: 1DStatus: Test not completed during this operation cycleOBDII: Transmission range (TR) sensor, PRNDL input - circuit malfunctionHonda: Short in Transmission Range Switch Circuit (Multiple Shift-position Input) ============8==============P1683(00)Raw code: 168300ECU: 11Status: Test not completed during this operation cycleOBDII: Metering Oil Pump Temperature Sensor Circuit MalfunctionHonda: Throttle Valve Default Position Spring Performance Problem ============9==============P2646(00)Raw code: 264600ECU: 11Status: Test not completed during this operation cycleOBDII: Rocker arm actuator A, bank 1 - performance problem or actuator stuck offHonda: VTEC Oil Pressure Switch Circuit Low Voltage ============10==============P2648(00)Raw code: 264800ECU: 11Status: Test not completed during this operation cycleOBDII: Rocker arm actuator A, bank 1 - circuit lowHonda: VTEC Solenoid Valve Circuit Low Voltage ============11==============P0507(00)Raw code: 050700ECU: 11Status: Test not completed during this operation cycleOBDII: Idle speed control (ISC) system - rpm higher than expectedHonda: Idle Control System RPM Higher Than Expected ============12==============P0506(00)Raw code: 050600ECU: 11Status: Test not completed during this operation cycleOBDII: Idle speed control (ISC) system - rpm lower than expectedHonda: Idle Control System RPM Lower Than Expected ============13==============P2227(00)Raw code: 222700ECU: 11Status: Test not completed during this operation cycleOBDII: Barometric pressure (BARO) sensor - range/performance problemHonda: Barometric Pressure (BARO) Sensor Circuit Range/Performance Problem ============14==============P0111(00)Raw code: 011100ECU: 11Status: Test not completed during this operation cycleOBDII: Intake air temperature (IAT) sensor - range/performance problemHonda: Intake Air Temperature (IAT) Sensor Circuit Range/Performance Problem ============15==============P1129(00)Raw code: 112900ECU: 11Status: Test not completed during this operation cycleOBDII: Downstream Heated O2 Sensors SwappedHonda: Manifold Absolute Pressure (MAP) Sensor Circuit Higher Than Expected ============16==============P1128(00)Raw code: 112800ECU: 11Status: Test not completed during this operation cycleOBDII: Upstream Heated O2 Sensors SwappedHonda: Manifold Absolute Pressure (MAP) Sensor Circuit Lower Than Expected ============17==============P0420(00)Raw code: 042000ECU: 11Status: Pending, Confirmed, Test not completed during this operation cycle, Warning indicator requestedOBDII: Catalytic converter system, bank 1 - efficiency below thresholdHonda: Catalyst System Efficiency Below Threshold ============18==============P0420Raw code: 0420ECU: 11Status: PermanentOBDII: Catalytic converter system, bank 1 - efficiency below thresholdHonda: Catalyst System Efficiency Below Threshold ============19==============P0420Raw code: 0420ECU: 11Status: PendingOBDII: Catalytic converter system, bank 1 - efficiency below thresholdHonda: Catalyst System Efficiency Below Threshold ============20==============P0420Raw code: 0420ECU: 11Status: ConfirmedOBDII: Catalytic converter system, bank 1 - efficiency below thresholdHonda: Catalyst System Efficiency Below Threshold | |||||
| Answer to: How do I fix diagnostic trouble code P0420 - Catalyst System Efficiency Below Threshold | 21Relevance | 5 years ago | Davit | Submit Your Question HERE | |
| My 2008 Dodge Grand Caravan catalytic converter gets burnt or at least gets an OBD code p0420 every time a couple months after replacement. I'm assuming something else is the cause ? I replaced the spark plugs and wires, and the only OBD code is the p0420. Any thoughts would be appreciated. | |||||