I'm new to the forum and have enjoyed the wealth of information here.

I wondered if anyone has any ideas for solve a problem I am having.

I recently (March) had an upgrade from MTM 315kw to 337kw. This involved downpipes new cats (100 cell) and a new chip. I already had the catback exhaust.

Since then have been getting "internal resistance too large on B1 and B2 S1" as sporadic errors. I have replaced the Airflow meter, B1 and B2 sensors but still comes up with this error.

Dyno reads 14.5 AFR from 1500 to 4600 rpm when it drops vertically to 10.4

Boost spikes at 25lbs the fluctuates to 21lbs. (1.6 bar to 1.3bar)

I'm not mechanically minded but am led to believe it should be running 12 - 12.1 AFR.

Does anyone know what the MTM dyno reading for AFR (lambda should look like).

Any ideas greatly appreciated.

 

MTM tuning always seems to run rich which might explain your car dropping to 10.4:1 but I don't know why it is so lean down low. What does "internal resistance too large on B1 and B2 S1" mean? I've never heard of that fault code and I've had my fair share of codes.

 

Error codes are P1113 and P1131

 

Looks like you need a new car