Reset 2011 Volvo XC90 check engine light on with Foxwell NT301 scanner

2011 Volvo XC90 check engine light on, use Foxwell NT301 OBDII scanner to reset successfully.


Car model and year: 2011 Volvo XC90 with 102k miles. use 93 octane gas.

Engine details:

2011 Volvo XC90 AWD, 6-speed automatic transmission
Engine code: 3.2 6-cyl B6324S
Engine size: 3,192 cc inline-6 (straight-6)
Engine type: gasoline, DOHC, naturally aspirated
Oil: 5W-30, 7.18 US qts (6.8 L)


Symptom: the check engine light came on

there is some snow on the ground but the roads care clear.


Using tool to read and clear the fault codes:

Foxwell NT301 OBDII scanner


Fault code:

P0420 and P0430

P0420 Catalyst System Efficiency Below Threshold (Bank 1)
P0430 Catalyst System Efficiency Below Threshold (Bank 2)


P0420 code is saying there’s too much of a differential between the front o2 sensor and the rear o2 sensor. This can be caused by an exhaust leak (particularly around the flex pipe) , an o2 sensor issue (typically the rear as the front controls the fuel mixture – which when off will throw other codes) or possibly an intake air leak or throttle body issues (less common)



I cleared the code using a Foxwell NT201 OBD2 scanner; the light went on again 8 miles later, this time with just the P0430 error.

The P0430 is what first lit up on the drive home from the dealership. I anticipate that the P0420 will light up soon as well –with a bit more driving.