Question about 1999 Honda Civic

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I have a trouble code reading a rich mixture in cylinder 1on my 1999 honda civic

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Sounds like an injector issue, probably needs replacement, but find and install a can of Techrolene, the techron ingredient of Chevron. On much more fussy EFI systems, like older Mercedes, this fluid really resolved most everything...

Get this fixed soon, or risk engine damage.

Doc

Posted on Sep 25, 2009

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Posted on Jan 02, 2017

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You have done everything except touch on what is wrong . code p0303 refers to cylinder 3 misfire detected===causes ---engine mechanical fault---wiring---ignition/ furl system---injector---RCT/MAF sensor--ECM
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1999 civic?
post engine option in car. gas, I4, and displacement
lots of engines, used world wide.
before working on any car or engine, know what's there? first.
P1 means unique to honda, P1 means factory code, P0 means federal generic codes.
did you scan this , or AUTOZONED.?
only 1 code, i too have trouble finding it..... is it correct.?
tell the full story, who got it, and how. and is there any driving symptoms

P1670
Electronic Feedback Signal Not Detected

see list here. (vast)
http://honda-tech.com/showthread.php?t=1739993

that will take a real FSM to find it. ever heard of FSM
or log in to alldata.com and look up 1670s.

there is little info on 1670, googling and ignoring all non honda post.
you must stay on HONDAs only. to get facts. here.

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1 Answer

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Dec 31, 2013 | 1999 Honda Civic

1 Answer

P0172


You should try to diagnose the problem.
A mechanic would use a scanner to watch the data coming from the O2 sensor to verify the mixture is rich. It could be a problem with the sensor, or something in the fuel system such as a leaking injector.

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2 Answers

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1 Answer

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Code 152 is for a high sensor signal from bank 2 sensor one. This is the sensor before the catalytic converter on the side with cylinder two.
The sensor is telling the computer the fuel mixture is too rich and that may or may not be true.
Code 175 is also for a rich mixture on bank two. Since you are getting both codes its possible you have a leaking injector on that side of the engine, or some other fuel problem.
It could also be a faulty O2 sensor sending a false signal.

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1 Answer

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1 Answer

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Whats going on here is that you have a too rich fuel air mixture. This will cause your misfiring and set off the PO172 Code. Your Bank 1 O2 Sensor is picking up the too rich mixture. This O2 sensor is location on the #1 Cylinder side (so you problem could be in #1/#3/#5 Cylinder). A dirty MAF Sensor, loose plug wire, dirty/broken spark plug, dirty fuel injectors, vacuum leak, and PCV Valve could all be a cause. I would run some injector cleaner through and also clean the MAF Sensor, change your PCV Valve. This would be an easy and cheap start for you. Good luck and thanks for using FixYa!

Sincerely,
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This code is not documented so the code reader is giving a false reading.
If the car runs OK and check engine light is not on, I would forget about it.

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