Hi

 

I have a yellow check engine light and an OBD2 scanner gives me the following errors:-

 

P0132 [0x0132]
Heated oxygen sensor (HO2S) 1, bank 1 - high voltage
HO2S Circuit High Voltage Bank 1 Sensor 1
Status: Confirmed
----------------------------
P0133 [0x0133]
Heated oxygen sensor (HO2S) 1, bank 1 - slow response
HO2S Slow Response Bank 1 Sensor 1
Status: Pending

 

I have taken the one lambda sensor (VWAG 03E 906 262 C 12V) that has easy access on the top of the engine, as I thought this would be bank 1, and tested the heating element with a multimeter.

 

It reports 4 ohms, the replacements I found online state 6 ohms.

 

So is this sensor faulty or is 4 ohms within the operating range?

 

Thanks

That is bank 1 sensor 1. 👍

You only have 1 bank of cylinders and sensor 2 will be further from the engine. 

The heater may be a positive temperature coefficient (PTC) type, and if so its resistance will vary strongly according to the temperature it is when measured. So it may well be OK. 

If you can tell me your engine code (or VIN) I can look up the wiring information. One side of the heater is usually directly from a fuse, the other side to an engine ECU pin.

 

 

Edited 13 September, 20232 yr by Breezy_Pete
spurious apostrophe

Hi thanks for that.

 

The engine is CGPA

Red/blue wire on pin 1 of the connector should have 12V from fuse 31 (10 amp) any time the engine is running.

Brown wire from pin 2 goes to engine ECU pin 4 on the 81-pin connector.

 

OK, it's too dark for me to check those tonight, so I'll do that tomorrow.

 

Assuming the wiring/fuse is OK, where should I look next, MAF sensor?

 

Thanks

Not sure, but certainly not MAF, your engine doesn't have one. It uses manifold pressure (MAP) sensor for air measurement.

How many miles has the car covered?

 

33k

Wow, super-low.

Not always a good thing. 

It was my Dads car, he passed away last year, but had been unable to drive it for a couple of years due to his health.

 

But he did get it serviced every year.

 

No problems until these errors,  a week after I got it serviced.

@MEMEME14What was actually done at the service,

just an Oil & Inspection service or was there servicing and maintenance getting done like the spark plugs getting replaced or at least checked, the air filter checked or replaced.

?

Did they offer a Fuel Treatment and did you accept that?   Which would be a shame if you did IMO.

Hi

 

It was put in for a full service, so yeah air filter was replaced, not sure if they checked the spark plugs, but I'm pretty sure they weren't replaced by the look of them.

 

No fuel treatment, offered but refused. 

@MEMEME14  Far from a full service then, where the brakes serviced the brake fluid changed or was it basically an Oil & Filter Service?

?

Who did it, not Arnold Clark was it?

?

Is the car running nice fresh petrol, none of the old stuff in it from months ago?

The fault code suggests the sensor itself is faulty rather than the heating element, given the incredibly low mileage I strongly suspect it's badly sooted up, cleaning it probably won't work but may be worth a try.

So oil & filters, brake inspection, fuel and radiator pipes and hoses, power steering fluid and auxiliary drive belt adjustment.

 

No not Arnold Clark, are they bad?

 

Yeah I use a whole tank every 2-3 weeks, so fresh petrol.

 

What are you thinking?

6 minutes ago, sepulchrave said:

The fault code suggests the sensor itself is faulty rather than the heating element, given the incredibly low mileage I strongly suspect it's badly sooted up, cleaning it probably won't work but may be worth a try.

 

I'm actually cleaning it at the moment, I thought it might be worth a try.

39 minutes ago, sepulchrave said:

The fault code suggests the sensor itself is faulty rather than the heating element

Good point. 

 

32 minutes ago, MEMEME14 said:

I'm actually cleaning it at the moment, I thought it might be worth a try.

How?

A blowtorch may be the way to go, carefully.