fault code help?

Santa

My engine management light come on the other day, and i got my mate who works for the RAC to plug in his laptop etc to it with their software, and two fault codes come up that were not known to his system.

P1133 DTC Unknown
P1171 DTC Unknown

Anyone have any ideas on what these are?

vocky

P1133 HO2S Insufficient Switching Bank 1 Sensor 1 = duff upper (mixture) lambda

P1171 unknown

bwatkins

Did you manage to track down the problem by any chance?

I have the same two codes on my VX220 accompanied by a small misfire on light acceleration and on the overrun.

By the way, P1171 is apparently 'Fuel Supply System Lean During Power Enrichment'. No idea what that really means I'm afraid but it's a start!

vocky

'Fuel Supply System Lean During Power Enrichment'

upper mixture lambda sensor is duff then, well was on mine :roll: