Borjawil Posted August 9, 2020 Report Share Posted August 9, 2020 09 journey 3.5 115k miles Just swapped in a used engine. O2 sensor code before and after. Misfire code not sure. Getting 15mpg city driving. 18-19 hwy. I believe the bank 1/ sensor 2 is the O2 sensor nearest the firewall on the cat correct? I've swapped a used one in but same code so bought a new one. Anyone know what the pins should read to rule out a wiring issue? As for the misfire I added it here just in case it's related, but I'll be checking power to the injector, swapping injectors, etc. to diag. Quote Link to comment Share on other sites More sharing options...
John/Horace Posted August 10, 2020 Report Share Posted August 10, 2020 Bank 1 is always the bank that has cyclinder #1 , could be front or back depending on how engine mounted. Sensor 2 is always after the cat, or downstream. Most sensors have 12 volts supply for build in heater, then other wires that send low 1-2 volt signal to pins in ecm. Codes best way to trouble shoot, milage also good indicator of functionality, as you already know. Should scan codes, bad O2 can create misfire codes sometimes. Best way to measure mpg is fill up tank, write down gallons and milage, then fill up again and write down milage. Then do the math. I find the on board automatic mpg indicators on cars are rarely very accurate. 2late4u 1 Quote Link to comment Share on other sites More sharing options...
Borjawil Posted August 13, 2020 Author Report Share Posted August 13, 2020 So 4 o2 sensors on this vehicle. Both sensor 1s are right after the manifold, and sensor 2 is on the cat I believe. Replaced the firewall side sensor on the cat. Fixed an exhaust leak after where the two cats connect to the rest of the exhaust. Swapped the plug and coil out on cyl 1. The car was saying I was getting 12-13 city prior and now says 17. So improvement but still have both codes showing. Erased them last night so I'll see if it comes back today. Quote Link to comment Share on other sites More sharing options...
Borjawil Posted October 5, 2020 Author Report Share Posted October 5, 2020 Still have a misfire code. Have swapped injectors, coil, new plug. No longer have an O2 code. Got a multiple random misfire code after swapping the intake and new gasket. Possibly due to new code for bank 1 (firewall side) tuning valve. Swapped out tuning valve from original intake and now have p1005. Thinking I pinched a wire from harness under intake. Will have to remove and see. Going to over lay wires from injector and coil for cyl 1. Quote Link to comment Share on other sites More sharing options...
John/Horace Posted October 5, 2020 Report Share Posted October 5, 2020 Multiple random misfire can be a split in the plastic intake manifold tubing after air filter. I’ve seen it on hyundai v6 engines although they are maf sensor engines, not map. Quote Link to comment Share on other sites More sharing options...
Borjawil Posted November 17, 2020 Author Report Share Posted November 17, 2020 Looked at the intake tube, saw what looked like small punctures. Swapped that and swapped the original intake on with the new gasket. No more codes. Also swapped the tuning valve back to the original intake. Not sure why that code decided to pop up with it in the other intake. 2late4u and OhareFred 1 1 Quote Link to comment Share on other sites More sharing options...
John/Horace Posted November 17, 2020 Report Share Posted November 17, 2020 Plastic gets brittle and engine vibration cracks the flex section sometimes. Can be tricky to see the cracks and sometimes it reseals and code goes away for a few days. Drives people nuts trouble shooting. Glad you figured it out. Quote Link to comment Share on other sites More sharing options...
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