Cat heat sensor

[Kevan]

I think I have failing Lambda sensors on my N/A. A while back the engine light came on and the car bogged right down. Fuel consumtion shot up alarmingly. Whilst "limping home" the cat temp light cam on.

 

Due to other commitments the car has been parked up for a while and the alarm drained the battery so there are currently no codes logged (constant, steady blink when I tried pulling them) but the cat temp light is still on. I've had a full emissions test which it sailed through so I believe the cat is OK, so it's the sensor that's FUBARed.

 

Can anyone let me know what the part number is for this sensor and, if possible, that for the Lambda sensor(s), I'd also like recommendations for suppliers please. I've tried the ToyotaDIY site but they don't seem to list them (or my searching skilss are weak, which is more likely)

 

Thanks in advance

 

K.

[ellis]

89465-19615 Oxygen Sensor - NA x 2 needed

[Kevan]

Thanks Ellis

 

Do you have the Cat Temp Sensor one too? That seems to be even harder to find than the O2 sensors :-/

 

K.

[Nic]

Duff oxygen sensors wouldn't cause a warning light or a sudden obvious loss in power, they would cause poor fuel consumption and a slight gradual loss in power over time.

 

The cat overheating warning is usually due to the cat innards collapsing effectively blocking the exhaust, this would have a noticeable effect on performance.

 

I'd replace the cats with decat pipes, fit new oxygen sensors and reset the ECU by disconnecting the battery for a few minutes - note the car may run a bit lumpy and not idle when first driven again until the ECU relearns the settings after a few miles.

[Nic]

Thanks Ellis

 

Do you have the Cat Temp Sensor one too? That seems to be even harder to find than the O2 sensors :-/

 

K.

 

You don't need a new cat temp sensor, if it has caused the cat overheating warning to come on it is probably working fine but just reacting to a fault such as a collapsed cat. The cat temp sensor has no effect on performance, but it *may* cause the ECU to go into limp home mode which may account for the sudden loss in performance

[Kevan]

Failed (or failing) sensors cause the engine warning light to come on but the codes were reset by the battery dying over time - the alarm drains it eventually - The loss of power was probably due to over-fuelling, another symptom of O2 sensors going.

 

The cats are fine as they were tested yesterday. I don't want to de-cat it as I can't be arsed with swapping bits of exhaust for the MoT. It's just too young to not need them :-/

 

To answer my earlier post, using the part-no that Ellis gave, I've been able to locate the sensors (all 3) on ToyoDIY so I can now start locating a supplier.

 

K.

[Kevan]

Sorry, missed your other post Nic, the engine fault light came on which coincided with it going into limp-home mode. It was during that journey that the temp light came on. As I said above, the cats arfe OK as I had a full emissions test done yesterday so it's looking probable that the sensor was permanently damaged. This theory has been supported by a Supra specialist who has advised that the cats rarely fail.

 

K.