VS Comm Exc. Series II ECU Codes 45, 46, &47

[pen77]

Having a long running battle with the car & finally got these codes.

Code 45: RH Oxygen Sensor Rich (O2)
Code 46: No Reference Signals while cranking
Code 47: Crank Angle Reference Signal

Can someone enlighten me as to the approx costs to fix this probs either via mechanic or myself?

Also, what the f*** does it all mean?
Being female, my so called "leave it to me" mates wont explain anything, but its my dame car & i wanna know !

Thanks

[pen77]

LOL ... didnt mean ill fix it myself, meant that if i purchased what i needed & had a mate do it

[Cheap6]

I'm not sure if this is what you want but...

The usual story with any code is to clear them and see what comes back. Sometimes the code will only set once and never come back = not a real fault. The conditions that are needed for the computer to set the codes can be fairly specific though, so you might have to drive the car for a while even if the fault is real. I suspect that these are the result of a real fault.

Here, post #23: Checking error codes VR/VS (Revised) on how to clear the codes.

The 46 and 47 point to a faulty Crank Angle Sensor (CAS). Less likely, is that there is a fault in the wiring or connections between the sensor and the computer in the car that controls the fuel metering, ignition systems, and transmission gear shifting if it's an automatic - the Power Train Control Module (PCM).

There will be plenty of info. in this forum about the CAS already as it is very common for it to fail.

If you are looking for it, the CAS is located to the LHS of the big pulley low down at the front of the engine. If it fails completely it will stop the car, although usually you get some warning with the car stalling intermittently first.

To replace the CAS involves removing the pulley to access it. It's maybe an hour's work at whatever rate the workshop you use charges. They may suggest that you have the oil seal behind the pulley replaced at the same time. This is reasonable => + 1/2 hour.

The O2 sensor is used by the PCM to fine tune the amount of fuel that is metered into the engine. It does this by measuring the amount of Oxygen (O2), if any, left in the exhaust after combustion occurs in the engine, hence the name.

Simplistically, the sensor generates a voltage that varies in proportion to the amount of Oxygen in the exhaust relative to that in the air. More voltage = less O2 in the exhaust.

The O2 sensor code means that the voltage from one of the sensors that is in each side of the exhaust, the RHS one in this case, is higher than what the PCM expects to see based on information from other sensors on the engine.

The presence of the code may indicate that the sensor has failed (they last ~100 000km, give or take a bit) or there is actually excess fuel
(actually absence of O2) in the exhaust.

My guess would be that it is related to the CAS code, which could result in excess fuel going into the engine, so I would replace the CAS first, then see if the O2 sensor code returns. If it is the O2 sensor, both sensors will be of similar age and condition, so both should be replaced at the same time. The wiring associated with the sensor can also affect the voltage the PCM 'sees'. The sensors are electrically heated. This can also cause problems and there is a modification to the sensor wiring to fix it. I'm not convinced that is the correct approach but some have found it successful.

[Surfwagon]

As above.
Also if the car is starting and running ok and not using heaps of fuel could be just a false code, so as said clear the faults then drive it for a wekk or so and recheck if they have come back then investigate further.

[john2803footy]

If I change my Co2 sensors 1998 vs 6, do I have to reset the computer? John