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Old 05-03-2015, 05:03 PM   #1 (permalink)
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Default No start after oxygen sensor replaced

Ok I have a 2004 Forenza S with about 81,500 miles. Recently replaced timing belt and water pump with car sounding and running great. The CEL came on and code was for O2 sensor in first position.

I did drive car for a couple weeks with out replacing O2 with no issue. Then I ended up going to hospital and car sat in ER parking for three weeks.

When I went to get car it started right up with no problems and drove at 55 mph. However, when I started up a hill the car started to sputter/buck...which I didn't quite realize until I went to drive following day when it continued to sputter. This seemed to happen mostly on any slight incline, but not exclusively.

I thought I had read that a bad O2 could cause the car to run rough so I figured it was time to finally replace. Replaced O2 with brand new sensor and tried to start car.

The car will crank normal, but will not turn over. Also possibly noteworthy is no power to the fuel pump fuse or the ignition coil fuse. Those fuses would flicker power when key was put into "on" position, but went right off. I am not sure if this is normal?

Anyway, there are many answers/options posted and I am not sure where to start first. I want to start with the easiest/cheapest option and work up.

Right now I have disconnected battery and pulled the ECM fuse to see if I can get the system to reset as I thought maybe the new sensor was being read as "no sensor" and thus would not start since it was thought to be "missing".

If this does not work, what else should I do? I understand all the mechanical process...just not intimate with what works best.

I also thought maybe a bad EGR? Was thinking to test this next.

Thanks in advance for any information you can provide
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Old 05-07-2015, 06:53 PM   #2 (permalink)
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Sorry for the late reply; I haven't logged in for a while.
Check the fuel pump relay (swap it out temporarily with a known good one).
If it does the same thing, check the ground wire located behind the engine on the lower right side just above the oil pan. You'll need to put the front end of the car securely on some jack stands and crawl underneath past the engine.
It is labeled G107 in the following diagram and it provides ground to the fuel pump relay.
Hope it helps someone.
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