Started late shifting into 2nd the other day. Not even a hard shift, just rpms go higher than usual and you almost have to wait on it or ease off the gas and it drops into 2nd. Drives fine otherwise. After reviewing this forum I decided to get my codes, expecting to see the infamous P1870 tanny slipping code. Got my codes from Autozone, they are as follows:
P0102 - MAF sensor circuit, low input P0171 - Feul Trim system lean @ upstream o2 sensor (left cylinder bank) P0174 - Feul Trim system lean @ upstream o2 sensor (right cylinder bank) P0420 - Oxygen storage ability of catalyst (left cyinder bank) below calibrated threshold (4.8L, 5.3L or 6.0L V8)
Okay, I somewhat understand what is going on here, but was hoping for more direct input from you guys.
it seams I should first check MAF for cleanlyness? (I do have the K&N FIPK) How can I go about checking it for functionality? Make sure it's clean and what about voltage thru it?
Are the "upstream" o2 sensors the pre-converters or post-converters?
What should I do first/ next? At roughly 50 bucks each on th o2 sensors, I'd kinda like to get it right the first time as to which to replace or if they need it at all.
Could this just be a vacume issue or faulty gasket?
Any help would me much appreciated.