Truck was running fine now getting these codes?

[lstruck]

Log shows it's close...

at PT the PLX says its a little leaner than stoich while the LTFT's say it's a little richer... (after the PCM applies the trims the wideband should say it's stoich)...

narrowbands are swing a little slow (1-2 times per second vs 3-5 times per second);

what fuel are you running...?

93 oct. and Narrowbands are like a day 4 days old when I did that log. Electrical problem maybe?

[lstruck]

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)
?

[joecar]

Something is wrong with the NBO2... we need a troubleshooting chart from the Service Manual, what year/model/vehicle is this...?

[lstruck]

04 two wheel drive auto silverado 5.3.

[joecar]

I'll look it up...


but in the meantime, here is some info (base on F-car):
P0135
P0155

[joecar]

Might be due to long tube headers losing heat ahead of the O2 sensors...

[lstruck]

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?