Right ok... so i have now just fitted a new cam belt / tensioner / aux belt... / bucket tappet things / spark plugs / to my HGT engine and its now running again woop woop...

I think 2 lambda sensors are faulty and i want to replace them.
I have looked on couple websites and they are £100 each.... (thats alot when you gotta buy 2) :bang:
Would universal ones do the same job ? i think i can pick these up for around £40 each...

I'd be inclined to check the lambdas you have! Lots of stuff on t'interweb on how to do it, or, is your car not OBD2 compliant so any fool can read the codes?

You don't say why you think the lambdas are fubar (and why should they both be?) -- it may well be a timing error or something else. Did whoever did it use the correct tools or tippex?

Universal lambdas can be a real swine to wire up and tend to be of poor quality.

fingers99 said:

I'd be inclined to check the lambdas you have! Lots of stuff on t'interweb on how to do it, or, is your car not OBD2 compliant so any fool can read the codes?

You don't say why you think the lambdas are fubar (and why should they both be?) -- it may well be a timing error or something else. Did whoever did it use the correct tools or tippex?

Universal lambdas can be a real swine to wire up and tend to be of poor quality.

Click to expand...

i agree wholeheartedly
of course if second lambda wasnt working it would put the light of doom on on the dash too

fingers99 said:

I'd be inclined to check the lambdas you have! Lots of stuff on t'interweb on how to do it, or, is your car not OBD2 compliant so any fool can read the codes?

You don't say why you think the lambdas are fubar (and why should they both be?) -- it may well be a timing error or something else. Did whoever did it use the correct tools or tippex?

Universal lambdas can be a real swine to wire up and tend to be of poor quality.

Click to expand...

I should have really said i put a diagnostic machine into my car and it said that 2 were faulty, when they are plugged in its rather jumpy, when ive unplugged them it goes ok apart from when you rev the engine then let it come to idle it jumps a little then goes a little ok again.

What's the error?

Scoped the sensor pattern to see if they're switching correctly?

As has been said- other sensors/engine problems can cause a correctly working sensor to 'see' bad info and cause more problems trying to correct it.

when i plug the diagnostic reader in, it says oxygen sensor 1 on bank 2 is faulty and the same for sensor 2 on bank 1.

What other sensors could affect these ? or is there a test i can do to see if my current lambda sensors are faulty ?

Tony123 said:

when i plug the diagnostic reader in, it says oxygen sensor 1 on bank 2 is faulty and the same for sensor 2 on bank 1.

What other sensors could affect these ? or is there a test i can do to see if my current lambda sensors are faulty ?

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Define "faulty"?

O.C/S.C to ground/batt+, heater O.C/S.C/ resistance too high/low, signal too high/too low, etc...

Any sensor that affects fuelling/airflow can affect lambda readings, as will an engine that's not running right due to timing issues.

D4nny8oy said:

Define "faulty"?

O.C/S.C to ground/batt+, heater O.C/S.C/ resistance too high/low, signal too high/too low, etc...

Any sensor that affects fuelling/airflow can affect lambda readings, as will an engine that's not running right due to timing issues.

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I know the timing is good.. so i dont think it be that.

whats o.c and s.c ?

Tony123 said:

I know the timing is good.. so i dont think it be that.

whats o.c and s.c ?

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If you didn't use the timing template tools- no you don't. Piston only has to be 0.1 mm from TDC for poor running issues.

Open Circuit/ Short Circuit

D4nny8oy said:

If you didn't use the timing template tools- no you don't. Piston only has to be 0.1 mm from TDC for poor running issues.

Open Circuit/ Short Circuit

Click to expand...

I borrowed some proper timing tools to time the engine

right i see.. do you think my emmisions control valve would cause my lambda sensors faulty, cause thats flagging up too on the diagnostic

Depends on the type of lambda fault.

ill plug sensor in before i go to bed and get exact message

Also make sure the radiator thermostat is opening correctly and all four plugs are sparking correctly. Running cold and missfires (even slight ones) will mess up the mixture control.

how i check that ? i cant drive the car about so the engine doesnt get hot... idling from cold

Run the engine until its hot. You wont get useful lambda readings on a cold engine.

If the head gasket has blown recently its possible all three lambdas are damaged.

Many folks fit decat pipes to the front precats and ignore the front two lambda faults.

Forgot to put the codes up...
U1601 - DTC definitions not found
U1600 - DTC definitions not found
P0443 - EVAP emission control system purge valve C fault
P0155 - o2 sensor heater circuit malfunction (bank 2 sensor 1)
P0141 - o2 sensor heater circuit malfunction (bank 1 sensor 2)
P0135 - o2 sensor heater circuit malfunction (bank 1 sensor 1)

Any ideas for the first 2 faults ?

All three O2 heater circuits could be a system fault somewhere.

well i have unplugged 2 so that could be the problem, when they were plugged in, i was only getting the 2 of them not working

Tony123 said:

well i have unplugged 2 so that could be the problem, when they were plugged in, i was only getting the 2 of them not working

Click to expand...

It's not going to help a diagnosis with sensors unplugged. :doh:

Tony123 said:

Forgot to put the codes up...
U1601 - DTC definitions not found
U1600 - DTC definitions not found
P0443 - EVAP emission control system purge valve C fault
P0155 - o2 sensor heater circuit malfunction (bank 2 sensor 1)
P0141 - o2 sensor heater circuit malfunction (bank 1 sensor 2)
P0135 - o2 sensor heater circuit malfunction (bank 1 sensor 1)

Any ideas for the first 2 faults ?

Click to expand...

First two are keycode (immobiliser) error codes.

Need to test the heater circuit (2 white wires) on the lambda's that are flagging up as faulty. If they aren't in O.C or S.C, your fault lies elsewhere and the sensors are fine.

Often several sensors will share 5v or 12v supplies, so it's possible there's a wiring fault causing your Evap valve to be faulty at the same time as the lambda's. Can't be sure without checking wiring diagrams...

Does this wiring diagram make sense ?

Do you know what is wrong with the immobilizer ? i have a random wire just sticking up in the engine, looks like an earth but dont know what for.

How do i test the wires ?