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Old 05-08-2004, 03:10   #1 (permalink)
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Oxygen Sensor

Hey all i had my cat replaced on the car few months ago, since then i can hear a hissing type noise when accelerating next to buildings. I thought it was just a leak in the exhuast (dodgy welding). Took car back they couldnt find any leaks so they thought it could be a dodgy cat or muffler.

Whats worrying me is could it be my cat blocking up again? I extracted fault codes seems that i got a code 133, Upstream Heated Oxygen Sensor circuit Slow Response - Bank No. 1. So does this mean my oxygen sensor is stuffed, and causing my CAT is block up again???

I checked my plugs today, on the tips they are grey, which means the car is leaning out. I think my car is down on power as well.

so do these symtoms relate to a stuffed oxygen sensor?

thanks
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Old 05-08-2004, 04:56   #2 (permalink)
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Re: Oxygen Sensor

Might be your injectors. I don't have anything on EL error codes, but I'm guessing that means either one of your injectors in bank one is rooted and causing the HEGO sensor to think it's running lean, or the injectors are on the way out and bank one happens to be below standard while bank 2 is still above.

I'd most likely say one of the injectors is gone. If the HEGO sensor was to blame the ECU would eventually learn it was faulty and run accordingly, giving you your power back. One rooted injector would cause the whole engine to loose a bit of power.

However grey plugs would point to all the injectors being on the way out.

As for the hissing, can't help you there, though it might be related.
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Old 05-08-2004, 05:39   #3 (permalink)
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Re: Oxygen Sensor

Sounds like fuel delivery if it's across all injectors. Might be time to check out the fuel pump, fuel hose, and regulator?
Probably a better idea - does she idle high? Those symptoms could also be caused by an intake leak, which would also explain the hiss.
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Old 05-08-2004, 09:41   #4 (permalink)
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Re: Oxygen Sensor

but lunaticSVT said it was the oxygen sensor?

nah doesnt idle high, but sometimes she takes a while to start when hot?

i dont get how it can be the injectors if the error code clearly states its the oxygen sensor?
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Old 05-08-2004, 13:17   #5 (permalink)
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Re: Oxygen Sensor

also i have a hot start problem sometimes.
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Old 05-08-2004, 17:12   #6 (permalink)
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Re: Oxygen Sensor

There could be other causes for the oxy sensor error. A similar code on EB/ED lists heaps of possible causes.

Air leak into exhaust manifold
MAP sensor reading low
ACT reading high
ECT reading high
Fuel starvation (injector fouling)
HEGO sensor
Wiring harness
ECU
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Old 05-08-2004, 17:29   #7 (permalink)
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Re: Oxygen Sensor

ah ok. Thats a tuff one to work out then!

weird i went to clear the fault codes before, followed the instructions but when i went for a retest fault code 133 appeared again?

I did this three times, to no avail!

also how do i test for all those things???

thanks
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Old 05-08-2004, 17:32   #8 (permalink)
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Re: Oxygen Sensor

also i looked at the manual they say to use paper clips to back probe two wires on the oxygen sensor.

Do they mean disconnect the oxygen sensor from the wiring harness or somehow shove paperclips into the connector? i didnt see anyway of doing this.
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Old 05-08-2004, 20:11   #9 (permalink)
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Re: Oxygen Sensor

geez everything is going wrong with this car at once!

just copped a flat battery is stuffed :)
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Old 05-08-2004, 20:44   #10 (permalink)
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Re: Oxygen Sensor

haha cars, gotta love em hey?

I have no idea what they mean by back probing.

As for narrowing down the fault, I also have no idea. lol sorry mate. i'm sure self serve wreckers will only charge a few bucks for a oxy sensor, try swapping it.
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