Multiple codes thrown repeatedly

[Splinter]

I'm getting codes for bad voltages across multiple sensors, codes are 21 22 and 33

IIRC, that's water temp, knock and speed

If I clear the codes, they come back on within a few moments of idling


My guess is that the damage Ive done to the battery is causing this, or that some water has gotten in

Any other hypotheses?

[Legacy777]

You could try testing the sensors and see what their resistance is.

What damage have you done to the battery?

[Splinter]

just constant undercharged cuz of my stereo

[Splinter]

This is weird.


Now the CE light is on almost constantly when the engine is cold, and seems to come on randomly, and while its on I lose all acceleration.


Bad knock sensor?

[Legacy777]

Are the codes the same, or do you get different codes?

[Splinter]

Same codes

[BAC5.2]

Check alternator output? You could have a failing alternator.

[Splinter]

I've already ordered another alternator

From the same guy Josh got his

[toomuch]

I had this situation on one of my cars it was throwing multiple codes (5 +/- don't recall exactly) but under diagnosis, everything checked out ok, sensors and loom...I solved it with a new ECU.

[Splinter]

Ah ha!

Apparently it wasnt the low voltage causing the codes.

They've all but stopped since I fixed the radiator. It seems that the constant jet of steam and water vapour into the engine bay was tripping sensors. I still get knock codes when I start the car with a lot of condensation on it, or driving through puddles, so I think my sensor needs replacing, or at least sealing with epoxy.