Thursday and Friday practice

Jamie Whincup topped the opening session with the fastest time for an opening session in Bathurst 1000 history. Macauley Jones had the first incident of the weekend, and the only one of the session, backing his Holden Commodore ZB into the wall at the Cutting. As well as doing damage to the rear bumper and chassis rail, the impact bizarrely popped the rivets out of the roof, which subsequently folded back on the car as the Tim Blanchard Racing driver stopped at Reid Park.^[10]

The first co-driver session was smattered with incidents, starting with multiple drivers running through the grass at the Chase. Twenty minutes into the session, the Mountain claimed its first major scalp with Luke Youlden hitting the wall at Sulman Park and ripping the front-right suspension out of the car, resigning it to the garage for the rest of the day. Jake Kostecki in the Kostecki Brothers Racing wildcard would make the same error at the end of the session, with Ashley Walsh bringing out the only other red flag of the session having locked up and run into the sandtrap at Murray's Corner. Jack Smith had a baptism of fire, brushing the tyre wall at Griffin's Bend in the Matt Stone Racing entry fifteen minutes in. James Moffat overtook DJR Team Penske's Alexandre Prémat in the dying seconds to set the fastest time in the GT Mustang.^[11]

Thursday's running ended with an incident-free third session, as championship leader McLaughlin broke his own Top Ten Shootout record by a tenth of a second on the first day of practice. The damaged #9 and #56 Commodores sat out the session, and all six Mustangs finished inside the top seven positions – the top six covered by less than three-tenths of a second.^[12]

Friday began with a co-driver session, topped by Will Brown in the second Erebus Motorsport Commodore. The session was stopped a matter of seconds after it began with Jake Kostecki running straight into the fence at Griffins' Bend after a steering rack stop was left in the car, for which the team received an AU$5,000 fine.^[13] Debutant Thomas Randle ran wide at Forrest's Elbow and lightly brushed the outside wall, but did not bring out the red flags. Garth Tander in Shane van Gisbergen's Triple Eight Race Engineering Commodore also ran wide at the first corner, nearly rejoining into the path of Moffat.^[14]

The final practice session before qualifying saw another big-name driver in strife, with Whincup crashing at the Esses in an attempt to avoid the already stranded Richie Stanaway. Elsewhere it was a struggle for the international drivers, as both Simona de Silvestro and Alexander Rossi found the sandtrap at Hell Corner in separate incidents. McLaughlin once again lowered the lap record by 0.3sec, with Andre Heimgartner producing the first sub 2:04 time for a Nissan Altima to finish second.^[15]

Provisional qualifying

The weather turned against crews ahead of the forty-minute qualifying session, and the circuit remained wet throughout. McLaughlin and Chaz Mostert traded fastest times, with the New Zealander ending the session on top. Van Gisbergen finished the session third ahead of Will Davison, with both Brad Jones Racing entries of Tim Slade and Nick Percat also making the ten. Having struggled for the majority of the session, Whincup put in a late time to elevate him to 7th from 23rd – whilst 8th placed Cameron Waters also had an interrupted session having spent most of it in the garage with an engine sensor issue. Rounding out the top-ten would be Mark Winterbottom and Anton de Pasquale, with the latter's team-mate and 2018 pole-sitter David Reynolds finishing the session 22nd. Another big name to struggle was Fabian Coulthard; the DJR Team Penske driver finishing 16th. Both 'Wildcard' entries ended the session down the back, with Brodie Kostecki beating Alexander Rossi to 24th by 0.03sec. Rounding out the field was Jack Le Brocq of Tekno Autosports, struggling heavily with the wet conditions.^[16]

Saturday practice

Saturday begun under grey skies. Will Davison set an early benchmark that would not be beaten, with only two other drivers setting a time under 2:05. The session stayed green throughout, however late in the piece James Hinchcliffe lost the rear of his Walkinshaw Andretti United Commodore on the exit of the Cutting and dragged the right-rear corner along the wall. All teams except DJR Team Penske elected to run both main and co-drivers in the session, Prémat proving the exception in the #17 Mustang. The Waters/Caruso entry continued to be plagued with mechanical issues; a stuck throttle leaving them on the sidelines for the early running.^[17]

Top Ten Shootout

The field went out in reverse order from qualifying, with De Pasquale setting the benchmark of 2:04.3. Mark Winterbottom went out next, with lock-ups at the Cutting and Forrest's Elbow leaving him six-tenths down on the Erebus driver. Cameron Waters moved to provisional pole with the first sub 2:04 of the session despite a moment at Sulman Park, before Jamie Whincup's attempt left him 0.03sec shy of the #6. The Brad Jones Racing pair did not challenge the top order, surpassing only Winterbottom with Percat ahead of Slade. Will Davison dropped in behind Whincup having felt he did not maximise his run, and Van Gisbergen dropped between the pair. Chaz Mostert, the penultimate runner, bettered Waters' time by a tenth – but McLaughlin proved unbeatable, beating Mostert's benchmark by four-tenths to claim his second pole position at the Bathurst 1000, and fifteenth of the 2019 championship.^[18]

Race

The race start was delayed as Brodie Kostecki stopped the Kostecki Brothers Racing wildcard entry at the exit of Forrest's Elbow on the original warm-up lap, complaining of breathing difficulties. The teams' Commodore ZB was towed back to the pits where it was discovered Kostecki's helmet fan was blowing dry ice from the drivers' cool box into his face and causing carbon monoxide poisoning. Brodie's cousin Jake jumped in the car to restart the race from the pit-lane, with Jake's older brother Kurt on standby should Brodie be ruled unfit to continue.^[19]

McLaughlin got the jump on Mostert heading into Hell Corner on the opening lap, with Michael Caruso slipping past his Tickford team-mate into second. As the field climbed the mountain for the first time, Tim Slade found himself on the wrong end of a mid-field battle with Scott Pye – a slight bump at Quarry Corner (Turn 5) sending the Brad Jones Racing Commodore into the outside wall and bringing out the safety car.^[20]

A safety car was deployed on Lap 135 in response to the stricken Commodore of Hinchcliffe and Rossi, which caused Coulthard, who was third at the time, to dramatically slow down the rest of the field. This happened as McLaughin and Whincup, who were first and second at the time respectively, headed into the pits. During this time the gap between Whincup and Coulthard, which was originally three seconds, extended out to over forty seconds. This caused a shuffle in positions, with several teams being better off, while others were worse off. Initially Coulthard was given a drive-through penalty for breaching safety car procedures, but when Ryan Story, Team Principal of DJR Team Penske, was interviewed about the issues, questions were raised that it was done by team orders.^[21]

Post race

The actions of DJR Team Penske during the Lap 135 safety car received mixed reception from team owners and drivers. Race runner-up Van Gisbergen described Coulthard as a "sacrificial lamb" and added that it was "pretty obvious" as to what had happened.^[22] Erebus Motorsport boss Barry Ryan claimed that DJR Team Penske had "blatantly cheated" and wanted points from the team stripped.^[23] Walkinshaw Andretti United's James Courtney, who finished third alongside Jack Perkins defended the team, stating that penalising the drivers would be "unfair" and stating that stripping McLaughlin of his maiden win would be "pretty harsh".^[24] McLaughlin, team-mate to Coulthard, was initially unfazed about the incident, but then lashed out at fans after it was revealed that Coulthard had received death threats after the incident.^[25][26]

DJR Team Penske were later charged for breach of team orders and had a hearing on 19 October. They were later found guilty and were fined $250,000, $100,000 suspended until 31 December 2021 and 300 points stripped from the teams' championship. Fabian Coulthard and Tony D'Alberto were both relegated to twenty-first position, the last running position, while Scott McLaughlin and Alex Prémat kept their first place.^[27] McLaughlin and Prémat were not penalised because the stewards' investigation found that the team's orders were intended to benefit Coulthard and D'Alberto; by slowing the field down, the team hoped that Coulthard would keep his position as continuing to the pits at race speed would mean an extended stop waiting behind McLaughlin.

Furthermore, on the 10 November, DJR Team Penske were fined $30,000 and Scott McLaughlin's pole time was stripped, after it was found that the valve lift in a number of cylinders had exceeded the maximum permitted valve lift prescribed by the ESD. The stewards ruled that this did not offer McLaughlin a performance advantage and the violation was so slight that the team could not have been aware of it. The team accepted the penalty, attributing the issue to improperly-calibrated machinery being used in assembling the engine. The penalty carried a flow-on effect to Race 30 at Sandown, which saw McLaughlin relegated to last position on the grid.^[28] McLaughlin retained his race win as the engine used in qualifying was replaced ahead of the race.