97 Camry 4 Cyl - Check engine codes P0125, P1135, and etc.

Well, you need to do some testing to determine exactly what is at fault. Check the AF sensors, the coolant temp sensor, look at fuel trim numbers, etc... Its tough to say what the problem is just by looking at codes.

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After a few days of observation (by carrying a OBDII scan tool on my car and retrieve/reset the error codes once the check engine light comes up), here is a summary.

(1) Normally there are multiple error codes but sometimes there is only one. Example: 5/26 AM - p0125, p1130, p1135 5/26 PM - p0125, p0171, p1135 5/27 AM - p0125, p0171, p1130, p1133, p1135 5/27 PM - p0171, p0171, p1135 (p0171 comes up twice) 5/31 AM - p0125 (single error code) 6/1 PM - p1135, p0171, p1135 (p1135 comes up twice) etc (2) The Check Engine Light (CEL) normally comes up after about 10 minutes of driving, from a cold engine. There are couple of times that right after I got the CEL, reset it, then kept driving, the CEL never came up again, as long as the engine is hot. (3) The engine temperature looks normal. It may be a little bit lower then before, or it could be my imagination. The time for the engine to reach the normal temperature is about the same too.

Base on the above observation, does it ring a bell to anyone?

Harry (97 Camry LE 4-Cyl, 78K miles)

Start with the coolant temp sensor, I'd hood a tool that reads live data and see what the coolant sensor is saying. Then you can go on