P0135 on a '98 V40 T4

Ginga · Sep 13th, 2018, 17:39

Hi guys.

Just wondering if you could guide me in this one.

I have a P0135 code in my V40, because of the 'front' O2 sensor heating circuit.
Thing is I measured the resistance in the sensor (don't recall the values) and it's not 'broken'. Neither is the heater fuse (didn't measure for continuity, just took a look at it).

My question to you is:
Assuming the sensor is ok, where's the weakest point in the circuit to look for the problem?
Is there any cable/path that's a common place for problems, causing a P0135?

Thanks!

clarkey1984 · Sep 13th, 2018, 17:47

Not sure of it'll be the same on a p1, plus mine were slightly different codes, but I had 4 fault codes for O2 sensors, low voltage on sensor 1 and 2, and slow response on both 1 and 2 as well, a new (2md hand) MAF has sorted mine, acceleration is definitely better and the check engine light went out by itself within 20 miles of changing it.

Ginga · Sep 15th, 2018, 13:52

Well, in the meantime I ordered a new sensor (NTK unit) but still, no o2 correct readings and no STFT movement.

I’ve check both power supply and ground at the plug and both read arround 12v, so no problem there.
The code as been cleared but returned once.
Cleared again and didn’t come on in a 5/6 mile trip. Mind you, there still is no correct (oscilating) reading from the O2 voltage.

I’m going to look at the ECM plug, clean it and re-test.
any ideas?

V40T4R · Sep 16th, 2018, 23:54

Quote:

Originally Posted by Ginga

Well, in the meantime I ordered a new sensor (NTK unit) but still, no o2 correct readings and no STFT movement.

I’ve check both power supply and ground at the plug and both read arround 12v, so no problem there.
The code as been cleared but returned once.
Cleared again and didn’t come on in a 5/6 mile trip. Mind you, there still is no correct (oscilating) reading from the O2 voltage.

I’m going to look at the ECM plug, clean it and re-test.
any ideas?

T4 engine need a zirconia o2 sensor @ pré cat. Confirm it's free from vaccum leacks.

Ginga · Oct 8th, 2018, 11:25

Didn't make anything more other then reset the Engine Light again.
Went for a trip and in the first 10km the sensors entered in Closed Loop and all is well.

There's some sort of self regenerating features about this van

Sep 13th, 2018, 17:39	#1
Ginga Junior Member Last Online: Mar 23rd, 2024 20:52 Join Date: Jan 2016 Location: Porto	P0135 on a '98 V40 T4 Hi guys. Just wondering if you could guide me in this one. I have a P0135 code in my V40, because of the 'front' O2 sensor heating circuit. Thing is I measured the resistance in the sensor (don't recall the values) and it's not 'broken'. Neither is the heater fuse (didn't measure for continuity, just took a look at it). My question to you is: Assuming the sensor is ok, where's the weakest point in the circuit to look for the problem? Is there any cable/path that's a common place for problems, causing a P0135? Thanks!

Sep 13th, 2018, 17:47	#2
clarkey1984 Premier Member Last Online: Apr 13th, 2022 09:41 Join Date: Jul 2014 Location: Beccles	Not sure of it'll be the same on a p1, plus mine were slightly different codes, but I had 4 fault codes for O2 sensors, low voltage on sensor 1 and 2, and slow response on both 1 and 2 as well, a new (2md hand) MAF has sorted mine, acceleration is definitely better and the check engine light went out by itself within 20 miles of changing it. __________________ 02 V40 T4 S, "Sargent silver" she's back!

Sep 15th, 2018, 13:52	#3
Ginga Junior Member Last Online: Mar 23rd, 2024 20:52 Join Date: Jan 2016 Location: Porto	Well, in the meantime I ordered a new sensor (NTK unit) but still, no o2 correct readings and no STFT movement. I’ve check both power supply and ground at the plug and both read arround 12v, so no problem there. The code as been cleared but returned once. Cleared again and didn’t come on in a 5/6 mile trip. Mind you, there still is no correct (oscilating) reading from the O2 voltage. I’m going to look at the ECM plug, clean it and re-test. any ideas?

Oct 8th, 2018, 11:25	#5
Ginga Junior Member Last Online: Mar 23rd, 2024 20:52 Join Date: Jan 2016 Location: Porto	Didn't make anything more other then reset the Engine Light again. Went for a trip and in the first 10km the sensors entered in Closed Loop and all is well. There's some sort of self regenerating features about this van

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