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Old 08-18-2021, 10:41 AM
Join Date: Aug 2021
Location: Connecticut
Posts: 1
Niltiac82 is on a distinguished road
Exclamation Please help....p0420 and p0430 codes on 2010 x3

I have a 2010 x3 that I bought 6 months ago. I had to replace the eccentric shaft sensor before I could get it started and now I have both p0420 and p0430 codes coming up. I have replaced both downstream sensor and bank 1 upstream sensor. I've also used cataclean once and nothing has changed. The car runs fine despite the codes. Any ideas what I should look for. I have a hard time believing it's both cats are bad but who knows. Has anyone else encountered this?

Freeze frame from last code reading:
Engine Coolant Temperature = 203 F
Fuel Trim Bank 1 Short Term = 3.125 %
Fuel Trim Bank 1 Long Term = -1.562 %
Fuel Trim Bank 2 Short Term = 4.688 %
Fuel Trim Bank 2 Long Term = -3.125 %
Engine RPM = 1,740 rpm
Speed (OBD) = 28.583 mph
Timing Advance = 7.5
Intake Air Temperature = 96.8 F
Mass Air Flow Rate = 98.182 cfm
Throttle Position(Manifold) = 19.216 %
Run time since engine start = 385 s
Fuel Level (From Engine ECU) = 95.686 %
Barometric pressure (from vehicle) = 14.794 psi
Voltage (Control Module) = 13.433 V
Engine Load(Absolute) = 25.49 %
Commanded Equivalence Ratio(lambda) = 0.995
Relative Throttle Position = 10.196 %
Ambient air temp = 82.4 F
Absolute Throttle Position B = 19.216 %
Accelerator PedalPosition D = 26.275 %
Accelerator PedalPosition E = 26.667 %

Last edited by Niltiac82; 08-19-2021 at 12:58 PM. Reason: Added information
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