Hi im having the same problem. And i noticed some oil drop coming from around timing cover what may be causing the check engine to blink and throw codes

 

If the check light is flashing there is a major misfire which can lead to converter failure. The problem is too rich of mixture.

Suggest you start with the ign system such as coil, ign wire, etc.

 

Toyomoho thanks for the reply. I'm not real families with this but I been trying to learn and I done checked my injectors and 3 of the 4 are off like 3 numbers apiece. And it burnt tons of gas other day. But not driven ant more till get fixed. Any info u can give me to help me understand what I need to do. Is very greatly appreciated sir. God Bless and thanks so much.

 

What does injectors being off mean?

What year of car?

If possible swap ign coil positions and determine if trouble code changes to another cylinder.

 

It is also throwing a 1135 code

 

Year of car?

Check the first A/F sensor on the exhaust system plus its wiring.

 

Toyomoho. My Camry is a 2001 LE. And how do I check the 0/2 sensor at motor. My injectors are #1 15.2 #2 14.9 #3 14.9 #4 14.9 and burned ton of gas last time I did over it. Thanks for all the help and everyone's time that helping me out. God Bless. Thanks again for your help

 

Did the engine ever run correctly?

 

Hey all. Having a similar problem with my 03 Camry. 2.4L 4cyl. Code P0303. Changed plugs, coil, and injector. Still throwing P0303. Autozone CEL service suggests a new Cat? Is that the only thing left it could be? Would hate to drop $600 and it be wrong again. Would it be worth a shot to change the valve cover gasket first just to see?

 

Speculate the only a way a converter could cause an issue is if was plugged up. Here a vacuum gauge can check for excessive exhaust back pressure. Read up on checking exhaust system back pressure.

Any other codes showing up such as P0171 or P0172? How does the engine run and idle? Has the MPG gone down? Any gas smell in exhaust?

Below is the list of possible issues.

Open/short in wiring or connector issue.
Vacuum hose leaks.
Ignition. Do a spark test and compare to another cylinder If you can swap coils with cylinders try this and determine if the code moves.
Injector.
Fuel pressure. This needs to be done by attaching a pressure gauge.
MAF. Try cleaning the MAF
Engine Coolant Temperature sensor (ECT). Temp between 167 and 212F
Compression.
Valve clearance or timing
PCV valve, hose and connections. Check this first.
Intake air leaks
Also check for exhaust leaks. Check the flex pipe on the exhaust for leaks..
ECM

A decent scanner can check real time coolant temp and MAF readings. Some can read how each cylinder is operating..