Exhaust gas temperature sensor

[melluke4]

Hi. We managed to get the car plugged in and it came up with code p2033 and P2084. Exhaust gas temperature sensor. Any one know Location of this.? Is it going to be costly? Need to sort it as Mot in October and I don't want to get rid of her. No limp mode or anything she is running OK. Engine light on. Any way of bypassing it.

[GiveMeABreak]

I'll need your VIN. I see there are some manufacturer-specific codes too from the screenshot. Once I have the VIN I can take a look as to how they relate to your specific engine. Generic third party diagnostic kits can't always access these specific codes.

There's not bypassing here - you either need to replace / repair the component. The whole system is interlinked - a fault in one place can lead to a fault in another if it is not fixed - so you need to find and eliminate the cause.

Once I have looked at all those codes, it will help point to a cause.

[NewcastleFalcon]

I have just replaced an Exhaust Gas temperature Sensor on my Vectra. On the VEctra there are 2 one upstream of the DPF, and one Downstream of the DPF.

The Vectra's was a simple two wire sensor. Faulty sensor was revealed by a simple resistance check. The replacement good sensor read around 220 ohms, the faulty one did show a resistance on the meter but it was in the hundreds of thousands of ohms.

Regards Neil

[melluke4]

Thanks Mark will get the vin number to you soon. Hubby has taken it to work.

[GiveMeABreak]

I have just replaced an Exhaust Gas temperature Sensor on my Vectra. On the VEctra there are 2 one upstream of the DPF, and one Downstream of the DPF.

The Vectra's was a simple two wire sensor. Faulty sensor was revealed by a simple resistance check. The replacement good sensor read around 220 ohms, the faulty one did show a resistance on the meter but it was in the hundreds of thousands of ohms.

Regards Neil

Don't get these confused with the DPF differential pressure sensors which have one up and downstream of the exhaust. With the gas temperature sensor there is only one of these - item 2 on a DW10BTED4 engine as an example.

[melluke4]

Thank marc vin as follows

VF7**************[VIN obfuscated, can be read by forum staff]

[GiveMeABreak]

Ok, I have that - I'll put up what I have momentarily for you.

[GiveMeABreak]

Ok, so here are the faults codes:

P1166
High pressure fuel regulation: Measured rail pressure higher than the maximum pressure. The pressure of the fuel high pressure common injection rail measured higher than the maximum pressure of 1800 bars for 6 seconds

Fault disappearance: Driving for 5 min with several full load accelerations for 10 seconds

Down Grade Modes when this fault is present:

• Deactivation of the speed limiter
• Deactivation speed limiter until the next time the ignition is switched on
• Deactivation of the cruise control
• Deactivation cruise control until the next time the ignition is switched on
• Request for Delayed Engine Stop
• The ECU limits the fuel flow

Symptoms: Lack of power, hesitation / cutting out.

Suspect:

• Electrical harness
• Connectors
• high pressure fuel pump
• Engine ECU
• High pressure fuel sensor

P1351
Is a common fault and means the glow plug relay is supplied and the plugs aren’t – so either the relay is not closing down on command from the ECU for 5 seconds.

Could be the glow plug relay or on or more of the glow plug (s). A relay change may be the easiest option to check first.

P2033
Catalytic converter downstream temperature signal: Voltage too high. The voltage of the signal of temperature downstream of the catalytic converter is higher than 4,98 V for 2s.

Symptoms: Lack of power

Suspect:

• Particle emission filter temperature sensor
• Electrical harness
• Connector

P2084
Catalytic converter downstream temperature signal: Value received incorrect. The voltage value of the temperature downstream of the catalytic converter is incorrect (For 1500 ms)

Symptoms: Lack of power

Suspect:

• Particle emission filter temperature sensor
• Electrical harness
• Connector

As mentioned this is the Exhaust Gas Temperature Sensor (item 2).

This is part number 1618PG. It is currently £139.63 inc. VAT from Citroen.

An Original new Part here One here for £98
https://www.ebay.co.uk/itm/Lambda-Senso ... 2029648955

[NewcastleFalcon]

With the gas temperature sensor there is only one of these - item 2 on a DW10BTED4 engine as an example.

Fair enough Marc. I didnt expect the Vectra's arrangement (2 EGT sensors in addition to the Pressure Sensor) to be replicated on the Citroen C5.

A simple resistance check of the sensor, may be able to give a good indication of whether the sensor itself is likely to be faulty. Is the expected resistance of a good sensor out the box for a C5 available?

My good sensor ((upstream) 200,000 miles) was 220 ohms, the brand new one out the box 220 ohms, the faulty one over 200K ohms.

Regards Neil

[melluke4]

Thanks for that but to be honest there is no lack of power. Would you still advise above actions. She has never gone into limp mode. We have knocking on the front which I will get sorted. Shifts like s**t off a shovel compared to my Nissan. That's why I want to keep it. Just repaired heater due to burnt out connection. Think I will try relay first. Just in case heater has put a gremlin in the electrical circuit. Any more advise much appreciated. Fighting against hubby who wants to get rid.

[GiveMeABreak]

Have a look for comparison on a 2.7 HDi here Neil - same on the 3.0 - you can see there are 2 Exhaust Gas Temp Sensors at (2) & (3), plus the two at (1) in addition to the DPF differential pressure pipe and sensors at (4) & (5). I can only see one marked for the OPs engine though.

[melluke4]

Thanks for that but to be honest there is no lack of power. Would you still advise above actions. She has never gone into limp mode. We have knocking on the front which I will get sorted. Shifts like s**t off a shovel compared to my Nissan. That's why I want to keep it. Just repaired heater due to burnt out connection. Think I will try relay first. Just in case heater has put a gremlin in the electrical circuit. Any more advise much appreciated. Fighting against hubby who wants to get rid.

[GiveMeABreak]

The DW10BTED4 is generally a very reliable engine (it's what I currently have). All I've done is list the fault codes (and the official guidance on the suspects for those faults).

Bear in mind that only one of those faults (P1166) will enact a backup mode by the engine ECU - and if you read through the conditions for its disappearance, a high load drive of 5 seconds will be enough to clear it - so it is an intermittent fault that you need to keep an eye on. Only when it is active will the backup mode come on.

As for the other faults - the Exhaust Gas Temperature sensor can be checked and cleaned - but if you have a diagnostic kit capable, you might be able to get some live data to check the readings and see if they are within the norms. Both those faults are related - one (P2033) is saying the voltage is too high and the other (P2084) is saying the data is invalid - to be expected if the sensor is not operating correctly.

[NewcastleFalcon]

The DW10BTED4 is generally a very reliable engine (it's what I currently have).

Is the expected resistance of a good sensor out the box for a C5 available?

I cant imagine the simple two wire resistance EGT sensor is going to be that different between different vehicles and I would wager theat a new C5 one out the box will measure 200 ohms or so.

If Its not available from your access to specifications, any chance you could measure it on your vehicle Marc just out of curiosity should the connector be accessible, and doesn't require being a member of the magic circle to work out how to disconnect it.

Could be useful for people falling on this thread with EGT errors, and it is a simple test of putting a multimeter on the resistance scale and poking the prongs into the connector.

Regards Neil

[melluke4]

Just a quick update. The wires to the exhaust temperature sensor were shot. Repaired the wires and all good.