As many of you know i have been experiencing a misfire in 4th gear on boost, however i have just done a self diagnostic on the cars ecu and codes 33 and 53 came up, i believe this is to do with oxygen sensors(not maf) , is this true?

 

Also what do i do now...?

that is both the o2 sensors

 

11: crank angle sensor circuit

12*: air flow meter circuit

13*: engine coolant temp. sensor circuit

14*: vehicle speed sensor circuit

21: ignition signal circuit

26*: boost pressure sensor

31*: ECU

32*: EGR function

33*: exhaust gas sensor circuit (left)

34: detonation sensor circuit

35*: exhaust gas temp. sensor circuit

42: fuel temp. sensor circuit

43*: throttle position sensor circuit

45*: injector leak

51*: injector circuit

53*: exhaust gas sensor circuit (right)

54: signal circuit from A/T control to ECU

55: NO malfunctions in the above

 

*Will cause the Check Engine light to come on under normal (MODE I) operating conditio

The sensors share a common earth and feed wire.check these for continuity.they are fused by the engine cont fuse as are the rest of the sensors/solenoids but if this had blown youd have loads of other issues.you should see 12v at the red/black wire and should get a variable voltage on the middle wire when you rev the car.this is the wire that signals the ecu.they enter on pin 29 and 55 of the ecu.