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| # | Post Title | Result Info | Date | User | Forum |
| Answer to: P0420 persists after cat and O2 sensor replacement | 34Relevance | 1 year ago | Chuck Tobias | Submit Your Question HERE | |
| You did not state the model year of your car. It sounds like your mechanic may have been throwing parts at the problem rather than engaging in deeper diagnostics. Here are some possible causes of p0420 and as well as suggested diagnostic procedures: Be sure that your electrical system is basically OK, battery and alternator in good condition and battery terminals not corroded. Voltage problems can cause all kinds of spurious problems in modern cars. | |||||
| Answer to: P0420, P0137 | 34Relevance | 2 years ago | Chuck Tobias | Submit Your Question HERE | |
| p0420 does not necessarily mean you have a bad catalytic converter. Have you looked up the list of potential causes and the diagnostic steps for those codes? (The 2 codes may have the same root cause.) | |||||
| Answer to: MY 2003 Honda Accord Coupe with 239,000 miles | 28Relevance | 11 months ago | Chuck Tobias | Submit Your Question HERE | |
| 1. Is there a question? If so a clear, concise description of your car problem belongs in the body of your post. There appears to be a partial attempt in the tags with most of it cut off since that's the wrong place. About the only intelligible part is "P0420". If you search for information on that code you will find there are a number of possible causes including, but not limited to, bad catalytic converter. 2. The title line should be used for a short description of your topic, not your vehicle description. (Title edited to reflect the OBD2 code found in the tags.) 3. For some reason, your browser is generating several duplicates when you submitted your post. (You accidentally posted this topic 4 times.) Are you having network issues? If so, then please wait until you have a stable connection. If you are pressing the submit button more than once, please stop. Press it once, and wait for it to finish processing. Otherwise it creates more work for moderators to clean up, and eventually the system will automatically ban your from entering. Thank you. | |||||
| Answer to: GS 350 cel on and mild knocking idle | 28Relevance | 1 year ago | Chuck Tobias | Submit Your Question HERE | |
| Since you are seeing essentially the same code for each engine bank it is likely something that is affecting both sides of the engine. See the following links for potential causes of p0420/0430 and diagnostic procedures: | |||||
| Answer to: Should I straight pipe my exhaust? | 28Relevance | 2 years ago | Chuck Tobias | Submit Your Question HERE | |
| Did you look up the various potential causes of that code? It may not be your catalytic converter. You need to do more diagnosis before taking action. | |||||
| 2007 Corolla dies while driving (VERY DANGEROUS) | 28Relevance | 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 ... | |||||
| Answer to: 2004 Toyota Camry SE P0420 | 27Relevance | 1 year ago | Chuck Tobias | Submit Your Question HERE | |
| While it is possible you have a bad catalytic converter don't overlook the other possible causes for that code. | |||||
| Answer to: P0420 | 27Relevance | 2 years ago | Chuck Tobias | Submit Your Question HERE | |
| You might want to check the other conditions that can trigger that code. | |||||
| 2010 Honda accord - several codes | 28Relevance | 5 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: P0420 | 27Relevance | 2 years ago | Chuck Tobias | Submit Your Question HERE | |
| Have you checked the other possible causes of the p0420 code? | |||||
| Answer to: Murano P0420 | 27Relevance | 2 years ago | Chuck Tobias | Submit Your Question HERE | |
| Did you look up the code to see what the causes for it might be? Codes are only a starting point for diagnosis, they tell you a condition exists but not necessarily what it actually at fault. | |||||
| Answer to: CODE P0420 2016 honda accord | 27Relevance | 2 years ago | Chuck Tobias | Submit Your Question HERE | |
| That depends what is actually causing the code. (Of course the code points out a condition rather than a specific part.) What kind of diagnostic steps did the dealer take to determine the cause, and what did they say the problem is? Here's some troubleshooting information if you'd like to so some of your own checking: Also be aware that the dealer is the most expensive option and necessarily the most competent or thorough at diagnosing problems. You'd be better off finding a good independent mechanic for any non-warranty work. (Avoid chain shops such as Pep Boys, Firestone, and Midas as well.) | |||||
| Answer to: P0420 | 27Relevance | 2 years ago | Chuck Tobias | Submit Your Question HERE | |
| Why did you do a "lacquer treatment"? Have you done any troubleshooting? p0420 is very common code with several possible causes other than the converter itself. (Codes only tell you that a particular condition exists, not what specific part or parts are causing the problem.) | |||||
| How do I fix DTC P0420 | 27Relevance | 3 years ago | ben.gau986 | Submit Your Question HERE | |
| ... O2 sensors were not, and were all fouled thanks to the excessive engine oil that was burned. After my engine was replaced, I replaced the sparkplugs and cleaned the O2 sensors. After all of that, my car ran much better, but it did have a decrease in power that seemed to get worse over time, the mpg was also not where it should have been. After months of a recurring p0420 code, and gas mileage of only 12-18mpg, I decided to suck it up and replace both O2 sensors with replacement ones from Denso. This only solved my check engine light for a day or two, bef ... | |||||
| Answer to: Tacoma trouble light P0420 Catalyst system efficiency | 27Relevance | 4 years ago | MountainManJoe | Submit Your Question HERE | |
| cat.con. may just be worn out | |||||
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