Well made all those changes that you said and I still have the same issues p0135 and p0155 and p0102(I know this one has to be set)
?
Something is wrong with the NBO2... we need a troubleshooting chart from the Service Manual, what year/model/vehicle is this...?
04 two wheel drive auto silverado 5.3.
Might be due to long tube headers losing heat ahead of the O2 sensors...
Why did it just start doing it now. for 6 years on maf and long tubes cam and heads never got a code. Now only change is 2bar map and FAST LSXRT intake. and CLSD tune. Just doesn't add up or exhaust leak maybe?