Yellow warning light, engine symbol with lightning bolt through it displays in 1997 Holden Astra GL

If it is a white outline of a car with a white vertical spanner (British word for wrench I understand), it only means "Service Required".

Give a call to a Holden dealership to ask about the symbol, and if it sounds like something they know about before agreeing to pay for Service.

https://www.mynrma.com.au/cars-and-driving/car-servicing/resources/what-do-my-dashboard-warning-lights-mean

What do my dashboard warning lights mean

Fix your car right away, by clicking the link
Astra 2008 2009 Factory Service Workshop repair manual Download

engine warning lights are also reporters for transmission faults
run the fault codes and check for problem over drive servo/solenoid or TCM problem

Tags location of knock sensor

https://outofthebooks.top/term/location-of-knock-sensor

Need to locate knock sensor on 1999 camry V6. Where is ... Cabin filter · I have 2003 astra Sri Turbo ts hatch the engine light is staying on but the car runs fine?

Common problems with the Astra G [Archive] - Astra Owners Network ...

www.astraownersnetwork.co.uk > ... > Astra Chat > Astra G

Mar 20, 2007 - 100+ posts - ‎100+ authors
Also, rear disc brakes on the SRi models have a tendancy to seize up ... Pre 2003 2.2i.... about 10mins but the engine temperature stays fine when running. it .... theengine manigement light is constantly on, but car running like a dream! ..... I have a 2007 astra sport hatch sxi 1.6 and seem to have a strange ...

Holden Astra known issues? - Holden - Automotive - Whirlpool

forums.whirlpool.net.au > Automotive > Holden

WhirlpoolDec 12, 2012 - The TS Holden Astras, late 90s to early 2000s, stay away. Unreliable ...People give the TS Astra a lot of flak but its a superb car. We have one ...

I'm not familiar with that paticular vehichle, but most are behind passenger side kick panel,on firewall in engine compartment. I've even seen them on inner fender wells, and under seats. Hope I could help with a sceintific wild a**ed guess.

some had dip stick to check and fill from which is in middle of engine and trans at front (where engine joins trans) black plastic lock over tang, engine dip stick is yellow. other model transmissions had a filler bolt hole which is in left side of gear box right next to where left drive shaft goes into gearbox even though its auto. some manual boxes had this same filler plug location and even on right side of box next to right drive shaft.

Check your alternator voltage need to be 13.7 to 14.3 volt engine running

I am not familiar with your vehicle, Ive never heard of it. However a lightning bolt symbol would probably indicate a problem with your electrical system, possibly the battery or alternator.

Send us symbol description or some pic, please.