Multiple OBDII Codes Keep Coming Back

1996 TOYOTA TACOMA
190,000 MILES
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INDYRJC11
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I have gotten the following scanner codes on my 1996 2.4L V-6 Tacoma:

P0130 O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
P0133 O2 Sensor Ckt Scam Response (Bank 1 Sensor 1)
P0171 Mod$10 System Too Lean (Bank 1)
P0120 TPS/Pedal Position Sensor A Circuit Malfunction

I replaced the Bank 1/Sensor 1 O2 Sensor but am still getting the codes after reset. The truck still seems to run fine for the most part although I do notice a momentary hesitation sometimes at cruising speeds. Other than that the truck basically runs fine.

Any ideas on what might be going on? Thanks......
Aug 14, 2013 at 9:57 AM
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DOCFIXIT
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Check for air leaks in intake snorkle especially around air flow meter. Hook up scanner key on engine off depress throttle to WOT while observing scanner for TPS % opening if 75 % + TPS OK. Also observe ECT temp is it in normal operating range? Check Bank 1 O2 sensor read out does it change when throttle depressed and released? Any exhaust leaks Bank 1?
Aug 14, 2013 at 11:21 AM
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INDYRJC11
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I found a tear in the intake snorkle where it is clamped onto the plenum (right behind the throttle) so I taped it up real good and reclamped it in place. I also replaced the TPS. Everything seemed fine for a few days but I got a CHECK ENGINE light again over the weekend. Now I have the following codes:

P0130 O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
P0133 O2 Sensor Ckt Scam Response (Bank 1 Sensor 1)
P0171 Mod$10 System Too Lean (Bank 1)

At least the P0121 TPS code seems to have disappeared. I'm not sure about exactly how to check the ECT temp or the Bank 1 O2 sensor (which is new) but the diagnostic tests on the scanner (Actron CP9150) all show either OK or N/A on the readouts. Any ideas? The truck seems to run OK otherwise. Thanks.....
Aug 20, 2013 at 1:42 PM
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DOCFIXIT
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Let me do some thinking and asking around see what I can come up with.
Be tomorrow
Aug 22, 2013 at 12:39 PM
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