Question about 1999 BMW Z3

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My check engine light came on with a code 15, (sensor) I changed all four sensors. Light is still comming on and for some reason when I took it to get inspected they say that they can't not get any readout fron the computer. Is there something that I have do to reset the computer or somthing.

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Code 15 is for knock sensor, either sensor is faulty or not tightened correctly

Posted on Jun 06, 2010

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My 1989 pontiac grand prix keeps stalling once it is warmed up after about 15 minutes of idle.


No, not the oxygen sensor. A couple of things you need to make clear. What light flickers, then stays on? That can't be a sensor light, it would have to be the "check engine light" or an engine temperature light (for like when your cluster has no temperature gauge, but just the "red light").
At any rate, the sensor you changed is not the engine temp. sending unit for the instrument panel. I believe on your '89 there would be two sensors for temp. One is the CTS for the engine computer, and the other is a sending unit for the dash, probably a 1 wire connector. It could be at fault, but it wouldn't cause stalling, I do not think anyway.
If it stalls and won't restart until cooled, this is a symptom of loss of ignition (spark) caused by either a faulty coil, or faulty Ignition Control Module (the coil controller), or last a faulty Crank Position Sensor (this sensor used by computer to determine ignition spark timing). You could test if ignition is lost, by checking for spark right after the engine warms and then stalls. If you have no spark to a spark plug right after it stalls, this is the reason for stalling. Usually it is the crank sensor, rather than the ignition control module or an ignition coil. Your car has 3 coils anyway in a "coil pack", so if one coil went bad, you'd still have two good coils, but engine would only be firing on four of the six cylinders-could easily stall a car.
You should check for trouble codes whenever you have a problem. A code might have been set. Easy to check for codes on your car, just ask if you don't know how-only takes a jumper wire or even a paper clip works. good luck.

Jun 16, 2016 | 1989 Pontiac Grand Prix

1 Answer

Had oil changed at new place. 2 days later check engine light came on. Hard time starting after I get gas. Checked oil light in car and says I only have 15% oil life left. Could this all be related?


as to 15 % left on oil life they forgot to reset -check oil level and filter [leak]-look under vehicle where oil pan is and check o2 sensors and wiring worker could have hit a wire or connector -have code checked can be 100s of reasons for code most auto stores offer this service for free and if its something like a damaged sensor or wiring in the area the shop was working go back and tell them about it

Aug 16, 2015 | Cars & Trucks

1 Answer

I have a montero sport 2001,and the check engine light came on ,I took it to auto zone they toll me to change the oxigen sensor,which I did four of them ,and the light still on after resting for about four...


Well, for starters they should have never told you to change the oxygen sensors. The codes they pull are only a guide and it is up tp a tech to find the underlying problem. It sounds like you have a catalytic convertor issue.

Jul 26, 2011 | 2001 Mitsubishi Montero

1 Answer

My check engine light said my speed sensors were bad so I had them all replaced and the light is still staying on. Nothing seems to be working improperly, the only thing that is wierd is when I hit a bump...


Check lights are an indication that the On Board
System had detected a failure. Usually a sensor
out of range

There is no code that tells you what is wrong
There is no code that tell you what to replace
There are no computers used to diagnose any
vehicle problems

So you had apparently sensors changed for no reason!

Codes are used to diagnose a system using knowledge
& trouble charts to find out why a check light was light
Sometimes a sensor does fail,but there are many other
reasons they set codes.

You never replace any sensor until you understand how they
work & how to test them. It isn't a guessing game & throw
parts at it

What place changed sensors & didn't resolve your vehicle
issues? Took your money for no solution to the initial complaint

Jul 11, 2011 | 2003 Hyundai Tiburon

1 Answer

I took my 89 mighty max to get smogged. It wouldn't pass for a few reasons. Co2 emissions were outrageously high and also there was no check engine light? Does an 89 mighty max have a check engine light? I...


not sure about engine light as i dont think it has one at this age but the CO2 is caused by either a O2 sensor of which you will only have one in front of the cat or the cat as well is past its sell by date ,Test the O2 sensor with a automotive meter for readings and continuety in the heater circuit ,but as a rule i change both at the same time as a four wire sensor is not a lot of money ,well a universal one isnt anyway and make sure the air filter is clean ,if they argue about the engine check light then go to dealer and ask for a copy of the certificate of homoglonation as this will state if it has a light or not

Mar 07, 2011 | 1989 Mitsubishi Mighty Max

1 Answer

2002 Jeep Liberty P0174 code and mech has changed the o2 sensor


Can't tell you exactly what is wrong but the one thing you said is of concern...Map sensor should not be full of oil. If it is, I'd want to know why. In finding the reason for that, you may also find the reason why you are having a problem.
Jeep uses two kinds of engine crank venting. you either have a pcv valve or an orifice controlled system. If either are obstructed it can overpressure the crankcase and cause all kinds of problems.
Years of experience tells me this isn't something I can guess at and be 100% sure I have the right answer but based on what you said, I'd look there first!

Feb 07, 2010 | 2002 Jeep Liberty

1 Answer

My engine light came on in my 2007 chevy montecarlo. when the engine light came on my car read engine has lost power. From that point my car would'nt go pass 15 miles per hour. Now when this happened the...


Codes don't always mean a bad senors. One new TPS sensor would have me moving on to something else. Put a scan tool on it and not just a code reader. Check fuel pressure with the gauge on the windshield as you drive.

Feb 07, 2010 | 2007 Chevrolet Monte Carlo

1 Answer

O2 sensor problem


I have a 97 gmc sierra .This truck is the same as the chevy ok.Its a 350 5.7 liter 4x4 Z71.I took it to auto zone which was my first mistake.They put it the scanner and said bad O2 sensor.Ok so which one is it i said.They dont know.Well there four (4) O2 sensors in this truck i hope you know that.I had to replace all four of them before i had to take it to a real shop.It seems the fuel pump i replaced a week earlier with an auto zone fuel pump was bad.Ive changed my feul pump 4 times now and have 235000 miles on still running.You need to get your fuel pressure checked.It should be 65 psi to start it and 55 psi to run it.If the pressures are good it could be a different O2 sensor or maybe the mass air flow senor.My last option would be the fuel pressure regulator because it seems to be a waste of time and money.I would get that fuel pressue checked first.Good luck.

Oct 30, 2008 | 1997 Chevrolet K1500

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