Join Date: Jul 2009
Location: North Texas
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Looking at your data, particularly lines 191, 192, 193, sensor 5 Equiv (lambda) and voltage (i.e. Bank 2 sensor 1) reports a 1.08 LEAN condition at line 191, which predictability slams the trims to +50, for lines 192 and 193.
The trims and lamba improve with high MAF (like line 186), which might indicate a bank 2 vacuum leak.
Is there a Bank2 Sensor 2 PID? That would help determine whether the upstream A/F has calibration issues and falsely reporting lean, or whether a vacuum leak is spiking the lambda.
You also disconnect the Bank2 sensor 1 (A/F sensor), which will force teh PCM to use the bank 1 sensor for both banks. Does that improve Bank 2 fuel trims? Does drivability improve, deteriorate, remain the same?
Fuel trims and MAF at idle in park?
'08 Highlander Base with goodies
'02 Highlander V6 (deep down in Africa)
'93 Camry LE V6 (departed)
'12 Pilot EX-L