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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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940 lambda light re-setting code??Views : 15974 Replies : 29Users Viewing This Thread : |
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Jan 26th, 2022, 14:54 | #21 | |
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Jan 26th, 2022, 15:13 | #22 | |
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With the keys safely in your pocket but preferably out of the vehicle, remove fuse #1 for a minimum of 30 seconds and replace it. Then you can use the car normally and the light should stay off. If not, read the fault codes. Note that even without the fuse installed the car can be started but the fault warning light aka Engine Management Light depicted as the Lambda Greek letter will NOT illuminate with #1 fuse removed. Yes, that is the only fusebox on these models - am i right in thinking you had a new Lambda sensor fitted or just had the old one bodged back in?
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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Jan 26th, 2022, 15:30 | #23 |
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Wow, 15 year old thread. The dark ages.
Disconnect battery negative for a minute. Alternatively read and clear the codes using the diagnostic socket on the NS strut.
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MY97 940 CD LPT Super Sports Edition 2 Turbo, Midnight Purple, 175,000 miles. |
Jan 26th, 2022, 15:59 | #24 |
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Thanks for that Dave.
I've had it bodged back in for the minute and ordering a new one this week, I imagine that the Lambda is totally shot but its worth a try for now. Cheers Liam. |
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Jan 26th, 2022, 16:17 | #25 | |
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If the EML comes on more or less straight away, chances are the heater in the Lambda has broken, it may put the light out if you switch off and restart once it's hot. However there's also a high chance the actual sensor is damaged so will still bring the light on although not as quickly. Let us know how it goes!
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Jan 26th, 2022, 22:58 | #26 |
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So... got home from work this evening, got straight in the volvo, took the fuse out and waited alittle over 30 seconds, put the fuse back in and turn it on. Boooom no light on and puring like a kitten! Dave you sir are a Saint!
Still having issues at it gets upto temp though dips power for a short period then comes back on. Last edited by Britland; Jan 26th, 2022 at 23:02. Reason: Didn't mention the users name who helped. |
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Jan 26th, 2022, 23:13 | #27 | |
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That said if you can live with it, with the warmer weather coming in it should warm up quicker anyway but i would definitely suggest renewing the 'stat before next winter.
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Jan 27th, 2022, 00:50 | #28 |
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Assuming pre-1994 cars are similar to later ones you lose remarkably little coolant replacing the thermostat without draining the system provided you park facing downhill. Conversely, you will lose a lot of coolant if you park facing uphill. You need the thermostat housing above the radiator.
Be careful undoing the M6 nuts. They are soft and easily rounded if they have been previously over tightened or are rusted. Use penetrating oil and a good quality 10mm socket. Personally, I would usually combine changing the thermostat with flushing the system and new coolant. However, if you’re chasing problems this might help. Be sure to have the right temperature ‘stat and the correct rubber gasket handy. |
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Jan 27th, 2022, 01:15 | #29 | |
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I think the OP is chasing a minor hiccup during warm-up, hence the advice about saimply renewing the 'stat - i'm sure you've read some of my posts where i explain my method of back-flushing etc which has always worked perfectly for me and those i've described it to except for one - they later admitted they'd skipped a step because they forgot and wondered why they had problems.
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Jan 29th, 2022, 13:54 | #30 |
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Changing Stat. without coolant loss.
I concur with Forrest re the stat. housing nuts. IIRC they are flange nuts. If they appear corroded dose with releasing fluid a few days before attempting the job, clean the threads of the studs and treat them gently.
Re the coolant. When I renewed my stat. last year I syphoned off coolant by feeding a plastic pipe through the coolant reservoir, down the pipe to the radiator and into the radiator. Collected coolant in a plastic contained. Changed stat. without any coolant loss then replaced the syphoned off coolant. Job done. I’ll try to look up how much coolant I syphoned off. Edit: I syphoned off 2 litres of coolant. The stat. kit was obtained from my main dealer. £17.80. Part no. VO0273307. https://www.volvoforums.org.uk/showthread.php?t=301913
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Ian. Since 2005: 1992 Volvo 940 estate 2.0L. Manual. Daily driver and workhorse. Last edited by Ian21401; Jan 29th, 2022 at 15:57. |
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