Hey Larry it's Carl from last night. Just got back on t...
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Customer
245 days ago
File attached (GZ1ZVQ3)
Chris (aka-Moose)
245 days ago
Howdy from Tennessee, I'm Chris aka Moose. Who am I helping today? I'm glad you've come here to get help. I will do my best to get the answer you are looking for. I help many customers, so sometimes my replies are delayed, I will respond once available. I try to be online at 1-5 pm and 10 pm-5 am every day.
This code indicates the catalytic converter is no longer working efficiently. If there are no other codes from the O2 sensors, MAF sensor, ignition system, or injectors, then there is not an air-fuel ratio concern. That would indicate the code is accurate and indicates the converter needs to be replaced. You can try these steps [https://www.dropbox.com/s/r2cimvb2blyqgnj/Air%20Fuel%20System%20Service.png?dl=0](https://www.dropbox.com/s/r2cimvb2blyqgnj/Air%20Fuel%20System%20Service.png?dl=0) to attempt to clean out the engine and converter to see if that brings the converter back ot life.
Thank you for seeking us for help, I hope I provided what was needed. Press reply if you need to follow up. If you liked my answer please let me know so I can mark your question complete. Moose
Chris (aka-Moose)
245 days ago
Checking in with you. Please let me know if you liked my answer, or need more help.
Customer
245 days ago
Changed the cat and cleared codes we will seeFrom what I could tell the O2 sensor reasons were ok
Chris (aka-Moose)
245 days ago
Keep in touch as needed
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Hey Larry it's Carl from last night. Just got back on this and did a bunch of diagnostics z(had to work this morning) FYI its the P420 code on a 2010 Equinox 3.4l 4-cyl 1. Bank 1 sensor varied from .2v to.9 v at idle & 2000r...
Hey Larry it's Carl from last night. Just got back on this and did a bunch of diagnostics z(had to work this morning) FYI its the P420 code on a 2010 Equinox 3.4l 4-cyl 1. Bank 1 sensor varied from .2v to.9 v at idle & 2000rpm (fuel trim varied from -3%-8%to16% 2. Bank 2 sensor remained consistent .69v to.75v at idle and 2000rpm 3. Backpressure at up & Down stream O2 sensors are at 1.25-1.5psi 4. Found small leak at muffler exit/tail pipe of the vehicle (see attached) It’s in the muffler seam at the hanger weld (cant believe that would throw the code)