I am experimenting a bit with the catless down pipe (please don't &#128293 I I used all kinds of spacers, it works... sort of...

I keep throwing pending code P0141 for secondary sensor heater but ONLY when I go WOT.

1. Question: why does WOT triggers P0141? normal driving no codes pending or permanent with CEL. We tried another O2 and still the same behaviour, normally o2 spacers are adjustable... getting the sensor "closer" triggers p0420 only... getting it a bit farther away triggers p0141 and even farther p0140 & p0141.

2. Do "Pending" codes affect drivability in terms on fuel trims or injector pulse? Or only "confirmed" codes?

Everything else is fine and drives perfect, it even reaches full readiness after three drive cycles...

 

the only thing I could think of is possibly the wire is pinched for the heater

 

Most likely because that spacer isn't working once things heat up. p0420 is what the ECU throws when the cat is "bad", or when you go catless without a tune.

 

Hi!!, did you solve this?