Car had 2 codes, an EGR low flow P0401 and P0420 cat inefficient code. Pulled EGR and TB, cleaned out EGR passages, which were completely blocked. Scan tool reset (did not reset LTFT trims) Tested bank 1 and 2 LTFT, which were 2.3 bank 1 and 7.1 bank 2. P0420 returned within 15 miles. Reset ECU with scan tool, code returned in 50 miles. Noticed the cat monitor was on for about 20 miles of drive time. Code returned again with same drive length. LTFT tended to remain the same level. Did a hard reset to clear LTFT. Notice now that the bank 2 LTFT is now at 8.1 at idle, in park and bank 1 is at 3.9
Should the LTFT be within 2-3 points of each other? So far the bank 1 P0420 has not returned, but I suspect it may return. Do you think there may be a slight clog yet that is keeping the trims that far apart (under a load at cruise, it is even at 6.3) If the bank 1 cat code returns, do you think the cat is bad?
have the same problem?
Thursday, September 11th, 2014 AT 5:46 PM