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H
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Discussion Starter #1
Got the check engine light two days ago. Went to Autozone and borrowed
the scan tool yesterday. Got 5 codes as follows.

P0125 - Insufficient Coolant Temperature for Closed Loop Fuel control.
P1135 - Air-Fuel Sensor Heater Circuit Response.
P0171 - System too Lean. (Bank 1)
P1130 - Air-Fuel Sensor Circuit Range/Performance.
P1135 (Repeat)

Deleted the codes, but check engine light came back on after about 10
minutes of driving. Reset the check engine light this morning (by
pulling EFI fuse for 1 minute). But again, it came back on after 10
minutes of driving. Any suggestion where I should start looking at?
Thanks in advance. (Searched the net, some say "fuel air ratio sensor",
others say "O2 sensor", "coolant temp sensor", etc.)

Car is a 97 Camry LE (4-Cyl), about 78K miles.

Harry (97 Camry LE 4-Cyl)
 
Q

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Discussion Starter #2
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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H
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Discussion Starter #3
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)
 
S

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Discussion Starter #4
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


--
Stephen W. Hansen
ASE Certified Master Automobile Technician
ASE Undercar Specialist


<[email protected]> wrote in message
news:[email protected]
> 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)
>
 

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2002 Solara SLE V6
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9,079 Posts
sorry to bring up an old thread, but it was actually solved on a different forum (OP posted same problem on a few forums). AF/O2 sensor issue.

http://www.mombu.com/asian_cars/fuel-and-lubricants/t-problem-solved-97-camry-4-cyl-check-engine-codes-p0125-p1135-and-etc-729917.html

hope it helps others, especially those used to googling engine codes :)
 
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