Engine Ticking - Help with Possible Causes
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Driver School Candidate
Joined: Sep 2014
Posts: 5
Likes: 0
From: Maryland
Engine Ticking - Help with Possible Causes
Hi. I'm Ray. I'm in the process of restoring a 1997 Lexus ES300. I recently had the oxygen sensor and knock sensor 2 replaced per a diagnostic test. I was hoping the knock sensor and new harness would correct a continuous tick I hear in my engine. It almost sounds like a bent rod. Well, needless to say, the check engine light is back on after a day. This time, it's only showing the oxygen sensor, which has already been replaced twice (I thought the 1st was defective). I intend to take advantage of a free engine diagnostic test coupon from AAMCO. However, I would like to be armed with some insight before venturing into a pool of sharks. 
Any advice concerning possible causes and inexpensive testing and fixes would be greatly appreciated. 
Any advice concerning possible causes and inexpensive testing and fixes would be greatly appreciated.
Pole Position
Joined: Dec 2013
Posts: 3,466
Likes: 920
From: wa
If you have a CEL, the first thing is to find out what it is. You can do this quickly for free - stop at most any auto parts chain and they will loan you a code reader. The connector is easily accessible under the steering wheel. Read the code and then consult a list of codes to see where the ECU is finding a fault. I use my local O'Reilly Auto as they are handy. They loan a large number of specialty tools.
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